There were some tense moments Monday afternoon in downtown Bangor.
An office building on State Street had to be evacuated after some sort of an explosion.
People on the first floor say they heard a slight rumbling sound coming from the basement and then a portion of the buildings electricity went out.
Bangor fire fighters checked the entire building for fire and say they found smoke coming from the basement.
They believe something blew in the buildings incoming power supply which would explain the smell of an electrical fire.
An electrician was being called to repair the damage.