By Eileen Sullivan and Jay Linday, Associated Press

WATERTOWN, Mass. — For just a few minutes, it seemed like the dragnet that had shut down a metropolitan area of millions while legions of police went house to house looking for the suspected Boston Marathon bomber had failed.

Weary officials lifted a daylong order that had kept residents in their homes, saying it was fruitless to keep an entire city locked down. Then one man emerged from his home and noticed blood on the pleasure boat parked in his backyard. He lifted the tarp and found the wounded 19-year-old college student known the world over as Suspect No. 2.

Soon after that, the 24-hour drama that paralyzed a city and transfixed a nation was over.

Dzhokhar Tsarnaev’s capture touched off raucous celebrations in and around Boston, with chants of “USA, USA” as residents flooded the streets in relief and jubilation after four tense days since twin explosions ripped through the marathon’s crowd at the finish line, killing three people and wounding more than 180.

The 19-year-old — whose older brother and alleged accomplice was killed earlier that morning in a wild shootout in suburban Boston — was hospitalized in serious condition Saturday, unable to be questioned to determine his motives. U.S. officials said a special interrogation team for high-value suspects would question him without reading him his Miranda rights, invoking a rare public safety exception triggered by the need to protect police and the public from immediate danger.

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President Barack Obama said there are many unanswered questions about the Boston bombings, including whether the two men had help from others. He urged people not to rush judgment about their motivations.

Dzhokhar and his brother, 26-year-old Tamerlan Tsarnaev, were identified by authorities and relatives as ethnic Chechens from southern Russia who had been in the U.S. for about a decade and were believed to be living in Cambridge, just outside Boston. Tamerlan Tsarnaev died early in the day of gunshot wounds and a possible blast injury. He was run over by his younger brother in a car as he lay wounded, according to investigators.

During a long night of violence Thursday and into Friday, the brothers killed an MIT police officer, severely wounded another lawman during a gun battle and hurled explosives at police in a desperate getaway attempt, authorities said.

Late Friday, less than an hour after authorities lifted the lockdown, they tracked down the younger man holed up in the boat, weakened by a gunshot wound after fleeing on foot from the overnight shootout with police that left 200 spent rounds behind.

The resident who spotted Dzhokhar Tsarnaev in his boat in his Watertown yard called police, who tried to talk the suspect into getting out of the boat, said Boston Police Commissioner Ed Davis.

“He was not communicative,” Davis said.

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Instead, he said, there was an exchange of gunfire — the final volley of one of the biggest manhunts in American history.

The violent endgame unfolded just a day after the FBI released surveillance-camera images of two young men suspected of planting the pressure-cooker explosives at the marathon’s finish line, an attack that put the nation on edge for the week.

Watertown residents who had been told in the morning to stay inside behind locked doors poured out of their homes and lined the streets to cheer police vehicles as they rolled away from the scene.

Celebratory bells rang from a church tower. Teenagers waved American flags. Drivers honked. Every time an emergency vehicle went by, people cheered loudly.

“They finally caught the jerk,” said nurse Cindy Boyle. “It was scary. It was tense.”

Police said three other people were taken into custody for questioning at an off-campus housing complex at the University of the Massachusetts at Dartmouth where the younger man may have lived.

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“Tonight, our family applauds the entire law enforcement community for a job well done, and trust that our justice system will now do its job,” said the family of 8-year-old Martin Richard, who died in the bombing.

The FBI was swamped with tips — 300,000 per minute — after the release of the surveillance-camera photos, but what role those played in the overnight clash was unclear. State Police spokesman Dave Procopio said police realized they were dealing with the bombing suspects based on what the two men told a carjacking victim during their night of crime.

The search by thousands of law enforcement officers all but shut down the Boston area for much of the day. Officials halted all mass transit, including Amtrak trains to New York, advised businesses not to open, and warned close to 1 million people in the entire city and some of its suburbs to unlock their doors only for uniformed police.

Around midday, the suspects’ uncle, Ruslan Tsarni of Montgomery Village, Md., pleaded on television: “Dzhokhar, if you are alive, turn yourself in and ask for forgiveness.”

Until the younger man’s capture, it was looking like a grim day for police. As night fell, they announced that they were scaling back the hunt and lifting the stay-indoors order across the region because they had come up empty-handed.

But then the break came and within a couple of hours, the search was over. Dzhokhar Tsarnaev was captured about a mile from the site of the shootout that killed his brother.

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A neighbor described how heavily armed police stormed by her window not long after the lockdown was lifted — the rapid report of gunshots left her huddled on the bathroom floor on top of her young son.

“I was just waiting for bullets to just start flying everywhere,” Deanna Finn said.

When at last the gunfire died away and Dzhokhar Tsarnaev was taken from the neighborhood in an ambulance, an officer gave Finn a cheery thumbs-up.

“To see the look on his face, he was very, very happy, so that made me very, very happy,” she said.

Authorities said the man dubbed Suspect No. 1 — the one in sunglasses and a dark baseball cap in the surveillance-camera pictures – was Tamerlan Tsarnaev, while Suspect No. 2, the one in a white baseball cap worn backward, was his younger brother.

Chechnya, where the brothers grew up, has been the scene of two wars between Russian forces and separatists since 1994, in which tens of thousands were killed in heavy Russian bombing. That spawned an Islamic insurgency that has carried out deadly bombings in Russia and the region, although not in the West.

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The older brother had strong political views about the United States, said Albrecht Ammon, 18, a downstairs-apartment neighbor in Cambridge. Ammon quoted Tsarnaev as saying that the U.S. uses the Bible as “an excuse for invading other countries.”

Also, the FBI interviewed the older brother at the request of a foreign government in 2011, and nothing derogatory was found, according to a federal law enforcement official who was not authorized to discuss the case publicly and spoke on condition of anonymity.

The official did not identify the foreign country or say why it made the request.

Exactly how the long night of crime began was unclear. But police said the brothers carjacked a man in a Mercedes-Benz in Cambridge, just across the Charles River from Boston, then released him unharmed at a gas station.

They also shot to death a Massachusetts Institute of Technology police officer, 26-year-old Sean Collier, while he was responding to a report of a disturbance, investigators said.

The search for the Mercedes led to a chase that ended in Watertown, where authorities said the suspects threw explosive devices from the car and exchanged gunfire with police. A transit police officer, 33-year-old Richard Donohue, was shot and critically wounded, authorities said.

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Dzhokhar Tsarnaev ran over his already wounded brother as he fled, according to two law enforcement officials who spoke on condition of anonymity because they were not authorized to discuss the investigation. At some point, he abandoned his car and ran away on foot.

The brothers had built an arsenal of pipe bombs, grenades and improvised explosive devices and used some of the weapons in trying to make their getaway, said Rep. Dutch Ruppersberger, D-Md., a member of the House Intelligence Committee.

Watertown resident Kayla Dipaolo said she was woken up overnight by gunfire and a large explosion that sounded “like it was right next to my head … and shook the whole house.”

“It was very scary,” she said. “There are two bullet holes in the side of my house, and by the front door there is another.”

Tamerlan Tsarnaev had studied accounting as a part-time student at Bunker Hill Community College in Boston for three semesters from 2006 to 2008, the school said.

Dzhokhar Tsarnaev was registered as a student at the University of Massachusetts Dartmouth. Students said he was on campus this week after the Boston Marathon bombing. The campus closed down Friday along with colleges around the Boston area.

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The men’s father, Anzor Tsarnaev, said in a telephone interview with AP from the Russian city of Makhachkala that his younger son, Dzhokhar, is “a true angel.” He said his son was studying medicine.

“He is such an intelligent boy,” the father said. “We expected him to come on holidays here.”

A man who said he knew Dzhokhar Tsarnaev and Krystle Campbell, the 29-year-old restaurant manager killed in Monday’s bombing, said he was glad Dzhokhar had survived.

“I didn’t want to lose more than one friend,” Marvin Salazar said.

“Why Jahar?” he asked, using Tsarnaev’s nickname. “I want to know answers. That’s the most important thing. And I think I speak for almost all America. Why the Boston Marathon? Why this year? Why Jahar?”

Two years ago, the city of Cambridge awarded Dzhokhar Tsarnaev a $2,500 scholarship. At the time, he was a senior at Cambridge Rindge & Latin School, a highly regarded public school whose alumni include Matt Damon, Ben Affleck and NBA Hall of Famer Patrick Ewing.

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Tsarni, the men’s uncle, said the brothers traveled here together from Russia. He called his nephews “losers” and said they had struggled to settle in the U.S. and ended up “thereby just hating everyone.”

Sullivan and Associated Press writers Stephen Braun, Jack Gillum and Pete Yost reported from Washington. Associated Press writers Mike Hill, Katie Zezima, Pat Eaton-Robb and Steve LeBlanc in Boston, Rodrique Ngowi in Watertown, Mass. and Jeff Donn in Cambridge, Mass., contributed to this report.

WATERTOWN, Mass. (AP) — A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead.

Police announced via Twitter that Dzhokhar Tsarnaev was in custody. They later wrote, “CAPTURED!!! The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody.”

Tsarnaev’s brother, 26-year-old Tamerlan, was killed Friday in a furious attempt to escape police.

Dzhokhar Tsarnaev had been holed up in a boat in a Watertown neighborhood. The crowd gathered near the scene let out a cheer when spectators saw officers clapping.

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“Everyone wants him alive,” said Kathleen Paolillo, a 27-year-old teacher who lives in Watertown.

Boston Mayor Tom Menino tweeted “We got him,” along with a photo of the police commissioner speaking to him.

During a long night of violence Thursday into Friday, the brothers killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle, authorities said.

The suspects were identified by law enforcement officials and family members as Dzhokhar and Tamerlan Tsarnaev, ethnic Chechen brothers who had lived in Dagestan, which neighbors Chechnya in southern Russia. They had been in the U.S. for about a decade, an uncle said, and were believed to be living in Cambridge, Mass.

Tamerlan Tsarnaev, a 26-year-old who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage of the marathon in a black baseball cap, was killed overnight, officials said. His younger brother, who had been dubbed Suspect No. 2 and was seen wearing a white, backward baseball cap in the images from Monday’s deadly bombing — escaped and was on the run.

Their uncle in Maryland, Ruslan Tsarni, pleaded on live television: “Dzhokhar, if you are alive, turn yourself in and ask for forgiveness.”

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Authorities in Boston suspended all mass transit and warned close to 1 million people in the entire city and some of its suburbs to stay indoors as the hunt for Suspect No. 2 went on. Businesses were asked not to open. People waiting at bus and subway stops were told to go home. The Red Sox and Bruins postponed their games.

From Watertown to Cambridge, police SWAT teams, sharpshooters and FBI agents surrounded various buildings as police helicopters buzzed overhead and armored vehicles rumbled through the streets. Authorities also searched trains.

“We believe this man to be a terrorist,” said Boston Police Commissioner Ed Davis. “We believe this to be a man who’s come here to kill people.”

The bombings on Monday killed three people and wounded more than 180 others, tearing off limbs in a spray of shrapnel and instantly raising the specter of another terrorist attack on U.S. soil.

Chechnya was the scene of two wars between Russian forces and separatists since 1994, in which tens of thousands were killed in heavy Russian bombing. That spawned an Islamic insurgency that has carried out deadly bombings in Russia and the region, although not in the West.

Investigators in the Boston case have shed no light on the motive for the bombing and have said it is unclear whether it was the work of domestic or international terrorists or someone else entirely with an unknown agenda.

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The endgame — at least for Suspect No. 1 — came just hours after the FBI released photos and video of the two young men at the marathon’s finish line and appealed to the public for help in identifying and capturing them.

State Police spokesman Dave Procopio said police realized they were dealing with the bombing suspects based on what the two men told a carjacking victim during their getaway attempt overnight.

8:55 PM UPDATE: Boston Police Department confirms they have Dzhokhar Tsarnaev, Suspect 2, alive, in custody.

Police say he is bloody. They are taking hime to Mount Auburn Hospital in Cambridge.

8:04 PM UPDATE: Law enforcement sources are telling reporters that they have Suspect 2 trapped in the backyard of a Franklin Street, Watertown, home.

Police have the yard surrounded and are moving cautiously because they are worried about booby traps and a suicide vest on the suspect.

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7:54 PM UPDATE: Reports of more gunfire heard by reporters on scene. This is happening now.

Witnesses may have heard flashbang grenades too.

FBI sources are telling NPR that the suspect is in the yard.

7:34 PM UPDATE: Multiple media reports that police saying a man is cornered in the backyard of a Franklin Street yard in Watertown.

This comes after gunshots were heard in the area. Law enforcement units are rushing to the scene.

7:21 PM UPDATE: Boston.com reporting that law enforcement source says Suspect 2 is pinned down in Watertown.

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7:16 PM UPDATE: Conflicting, unconfirmed reports about bombing suspect found on Franklin Street. 

Are you in Boston?

If you’re in Boston or in contact with someone in the Boston area and can comment on the manhunt, contact us at webdept@sunjournal.com or 1-800-482-0753

6:15 P.M. UPDATE: ‘Sheltering’ is over?

5:11 PM UPDATE: Maine detective helps with bombings investigation

PORTLAND (AP) — A Maine State Police detective is in Boston assisting with the investigation of the Boston Marathon bombings.

A state police spokesman tells WMTW-TV (http://bit.ly/104FfzB ) that the detective has a certain area of expertise that investigators needed but would not say what that skill was.

Spokesman Steve McCausland says the detective will stay in Boston as long as police and the FBI need him.

3:49 P.M. UPDATE: To add to the confusion, police say they have conflicting reports on whether the brothers robbed a 7-Eleven in Cambridge, near the campus of the Massachusetts Institute of Technology, on Thursday night.

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3 P.M UPDATE: Fla. runner gets photo of suspect fleeing scene

JACKSONVILLE BEACH, Fla. (AP) — A Florida man who ran in the Boston Marathon unknowingly captured a photo of one of the suspects leaving the scene.

David Green of Jacksonville Beach told The Associated Press he finished Monday’s race about an hour before the twin blasts. He said he and friends were watching the rest of the race when he went to a nearby store to charge his cellphone.

While he was returning, the bombs exploded. He snapped a photo, put the phone back in his pocket and went to help the injured.

It wasn’t until Thursday that he knew what he had: a picture of one of the suspects, Dzhokhar A. Tsarnaev, wearing a distinctive backward white baseball cap and walking away from the scene.

2:35 UPDATE: First, the Auburn Walmart is open after it was cleared because of a bomb threat. Everyone is safe.

Second, there are confusing reports from the Massachusetts State Police. Early in the day they reported they were looking for a Honda CRV.

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Then they reported finding the CRV and that they believed the bombing suspect slept in it.

Later reports circulated they were looking for a Honda Civic.

Now, they MSP says the CRV they were looking for earlier in the day is actually a Honda Civic. And they found that Civic.

Boston Marathon Bombing: City shuts down for manhunt

1:35 P.M. UPDATE: Massachusetts Emergency Management Association wants anyone “sheltering” at work to go home. 

1:25 p.m. UPDATE: Red Sox game cancelled

Uncle urges bombing suspect to turn self in

11:40 a.m. UPDATE: Chief: Slain MIT officer was dedicated, well liked

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Lowell Sun story: Dead bombing suspect boxed in Lowell Golden Gloves

11 a.m. UPDATE: There is a lot of law enforcement activity reported in Watertown. Boston.com reports local and state police, Secret Service, dog teams explosive experts and SWAT are search a 20-block area.

Also, the Honda CRV was found abandoned. Police say the suspect fled on foot. But there is no word on who that suspect is. It is not clear the driver is Dzhokhar A. Tsarnaev.

10:56 a.m. UPDATE: Police scanner has conversation about a man in Watertown with something in his hands. They do not think he has anything to do with manhunt. Rumors in social media say he has a bomb.

10:29 a.m. UPDATE: @CambridgePolice reporting suspicious packages at different locations. No report on why they are suspicious.

10:21 UPDATE: USAToday is reporting that a law enforcement official says authorities are investigating the brothers’ possible link to a third person. The identity of person was not immediately clear.

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10:10 a.m. UPDATE: Bruins cancel morning skate; Red Sox on hold

BOSTON (AP) — The Boston Bruins and Pittsburgh Penguins have canceled their morning skates because of the manhunt for the Boston Marathon bombers.

Bruins spokesman Matt Chmura said there’s no announcement yet on whether to proceed with Friday night’s NHL game.

The Boston Red Sox are also on hold for their night game against the Kansas City Royals. Red Sox spokesman Kevin Gregg said the Royals have been in town since Wednesday night and spent their off day in the city on Thursday.

9:26 a.m. UPDATE: Boston travel: Trains, buses halted, planes flying

NEW YORK (AP) — Transportation to and from the Boston area is virtually shut down Friday morning, with the exception of airplanes, which continue to take off and land at Logan International Airport.

Amtrak has stopped trains about an hour south of the city in Providence, R.I. The Massachusetts Bay Transportation Authority, which operates commuter trains into Boston as well as the city’s subway — called the T — and the city’s buses suspended all operations.

JetBlue, the largest airline in Boston, is allowing anybody scheduled to fly to or from Boston to change their ticket for free.

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Megabus has canceled at least 18 buses between Boston and New York, New Haven, Conn., Hartford, Conn., Burlington, Vt. and Philadelphia.

9:15 a.m. UPDATE: Authorities ID name of wounded transit officer

WATERTOWN, Mass. (AP) — Authorities have identified the transit police officer severely wounded in a shootout with the Boston Marathon bombing suspects.

MBTA Police Chief Paul MacMillan says the wounded officer is 33-year-old Richard Donohue. He is a three-year veteran of the department.

Gov. Deval Patrick says Donohue is in surgery at Mount Auburn Hospital in Cambridge.

The officer was critically injured in an early morning shootout Friday with the two suspects in the marathon bombings. One of the suspects was killed.

Earlier in the night in Cambridge, a Massachusetts Institute of Technology police officer was killed while responding to a report of a disturbance involving the two suspects. The officer died of multiple gunshot wounds.

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9:12 UPDATE: Someone in Boston is livestreaming the police scanner.

9 a.m. UPDATE:

The stories of the 2 brothers suspected in the bombing

BOSTON — In May of 2011, Dzhokhar A. Tsarnaev, then a senior at a prestigious high school, was awarded a $2,500 scholarship from the c […]

Maine Alert

Amtrak’s Downeaster train service has been suspended Friday morning because of the manhunt in Boston.

9:20 a.m. UPDATE: WATERTOWN, Mass. (AP) — The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area.

The suspects were identified by law enforcement officials and a family member as Dzhokhar and Tamerlan Tsarnaev, brothers from a Russian region near Chechnya, which has been plagued by an Islamic insurgency that has carried out deadly bombings.

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Tamerlan Tsarnaev, a 26-year-old who had been known to the FBI as Suspect No. 1 and was seen in surveillance footage in a black baseball cap, was killed overnight, officials said. His 19-year-old brother — dubbed Suspect No. 2 and seen wearing a white, backward baseball cap in the images from Monday’s deadly bombing at the marathon finish line — escaped.

The law enforcement officials spoke on condition of anonymity because of the sensitivity of the unfolding case.

Authorities in Boston suspended all mass transit and warned close to 1 million people in the entire city and some of its suburbs to stay indoors as the hunt went on. Businesses were asked not to open. People waiting at bus and subway stops were told to go home.

“We believe this man to be a terrorist,” said Boston Police Commissioner Ed Davis. “We believe this to be a man who’s come here to kill people.”

The bombings on Monday killed three people and wounded more than 180 others, tearing off limbs in a spray of shrapnel and instantly raising the specter of another terrorist attack on U.S. soil.

The endgame — at least for Suspect No. 1 — came just hours after the FBI released photos and video of the two young men at the finish line and appealed to the public for help in identifying and capturing them. Tips came pouring in to the FBI immediately, but exactly how authorities managed to close in on the two young men was not immediately disclosed.

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The men’s’ uncle, Ruslan Tsarni of Montgomery Village, Md., told The Associated Press that the men lived together near Boston and had been in the U.S. for about a decade. They traveled here together from the Russian region near Chechnya.

The White House said President Barack Obama was being briefed on developments overnight by Lisa Monaco, his assistant for homeland security and counterterrorism.

The images released by the FBI depict the two young men walking one behind the other near the finish line. Richard DesLauriers, FBI agent in charge in Boston, said Suspect No. 2 in the white hat was seen setting down a bag at the site of the second of two deadly explosions.

Authorities said surveillance tape recorded late Thursday showed Suspect No. 2 during a robbery of a convenience store in Cambridge, near the campus of MIT, where a university police officer was shot to death while responding to a report of a disturbance, said State Police Col Timothy Alben.

From there, authorities said, the two men carjacked a man in a Mercedes-Benz, keeping him with them in the car for half an hour before releasing him at a gas station in Cambridge. The man was not injured.

The search for the vehicle led to a chase that ended in Watertown, where authorities said the suspects threw explosive devices from the car and exchanged gunfire with police. A transit police officer was seriously injured during the chase, authorities said.

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In Watertown, witnesses reported hearing multiple gunshots and explosions at about 1 a.m. Friday. Dozens of police officers and FBI agents were in the neighborhood and a helicopter circled overhead.

Watertown resident Christine Yajko said she was awakened at about 1:30 a.m. by a loud noise, began to walk to her kitchen and heard gunfire.

“I heard the explosion, so I stepped back from that area, then I went back out and heard a second one,” she said. “It was very loud. It shook the house a little.”

She said a police officer later knocked on her door and told her there was an undetonated improvised explosive device in the street and warned her to stay away from the windows.

“It was on the street, right near our kitchen window,” she said.

State police spokesman David Procopio said: “The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers.”

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Boston cab driver Imran Saif said he was standing on a street corner at a police barricade across from a diner when he heard an explosion.

“I heard a loud boom and then a rapid succession of pop, pop, pop,” he said. “It sounded like automatic weapons. And then I heard the second explosion.”

He said he could smell something burning and advanced to check it out but area residents at their windows yelled at him, “Hey, it’s gunfire! Don’t go that way!”

Doctors at a Boston hospital where Suspect No. 1 died said they treated a man with a possible blast injury and multiple gunshot wounds.

In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia.

Those raids included a raid in Moscow in October 2002 in which a group of Chechen militants took 800 people hostage and held them for two days before special forces stormed the building, killing all 41 Chechen hostage-takers. Also killed were 129 hostages, mostly from effects of narcotic gas Russian forces used to subdue the attackers.

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Chechen insurgents also launched a 2004 hostage-taking raid in the southern Russian town of Beslan, where they took hundreds of hostages. The siege ended in a bloodbath two days later, with more than 330 people, about half of them children, killed.

Insurgents from Chechnya and other regions also have launched a long series of bombings in Moscow and other cities in Russia. An explosion at the international arrivals hall at Moscow’s Domodedovo airport in January 2011 killed at least 31 people and wounded more than 140.

Timeline

BOSTON (AP) — Key moments related to the search for the Boston Marathon bombing suspects, based on reports from the Middlesex County district attorney, Massachusetts State Police, and Boston police.

• At 5:10 p.m. Thursday, investigators of the bombings release photographs and video of two suspects. They ask for the public’s help in identifying the men.

• Around 10:20 p.m., shots are fired on the campus of the Massachusetts Institute of Technology in Cambridge, just outside Boston.

• At 10:30 p.m., an MIT campus police officer who was responding to a disturbance is found shot multiple times in his vehicle, apparently in a confrontation with the Boston Marathon bombing suspects. He is later pronounced dead.

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• Shortly afterward, two armed men reportedly carjack a Mercedes SUV in Cambridge. A man who was in the vehicle is held for about a half hour and then released unharmed at a gas station on Memorial Drive in Cambridge.

• Police soon pursue the carjacked vehicle in Watertown, just west of Cambridge.

• Some kind of explosive devices are thrown from the vehicle in an apparent attempt to stop police. The carjackers and police exchange gunfire. A transit police officer is seriously injured. One suspect, later identified as Suspect No. 1 in the marathon bombings, is critically injured and later pronounced dead.

• Authorities launch a manhunt for the other suspect.

• Around 1 a.m. Friday, gunshots and explosions are heard in Watertown, just outside Boston. Dozens of police officers and FBI agents converge on a Watertown neighborhood. A helicopter circles overhead.

• Around 4:30 a.m., Massachusetts state and Boston police hold a short outdoor news briefing. They tell people living in that section of eastern Watertown to stay in their homes. They identify the carjackers as the same men suspected in the marathon bombings. Overnight, police also release a photograph of a man believed to be Suspect No. 2, apparently taken from store video earlier in the evening at a 7-Eleven convenience store in Cambridge. He is wearing a grey hoodie-style sweatshirt.

• Around 6:35 a.m., The Associated Press reports that the bomb suspects are from a Russian region near Chechnya and lived in the United States for at least one year.

• Around 6:45 a.m., The Associated Press identifies the surviving Boston bomb suspect as Dzhokhar A. Tsarnaev, 19, who has been living in Cambridge, Mass.

• Around 8:40 a.m., a U.S. law enforcement official and the uncle of the suspects confirm that the name of the slain suspect is Tamerlan Tsarnaev, Dzhokhar Tsarnaev’s older brother.

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