JACKSONVILLE BEACH, Fla. — 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.

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