CONCORD, N.H. (AP) – Fire investigators were looking into what started a two-alarm fire that damaged the roof at the New Hampshire State Prison early Friday.

Firefighters were called to the prison around 2 a.m.

Corrections spokesman Jeff Lyons said the flames were confined to the roof above a multi-purpose room that’s not near any inmate living areas. No one was hurt and there was no inmate evacuation, he said.

Lyons said workers have been putting a new roof on that section of the prison.

The state fire marshal’s office has been called in, but Lyons said so far, it’s looks like the fire was accidental.