They set off a string of bombs that damaged equipment in the machine room and started a fire that authorities rushed to put out.
VOA: standard.2010.07.21
One of the fire investigators, who had been standing by an open door in the living room, escaped moments before the oxygen-starved fire roared out of the room into the hallway a fireball that caused the corridor to go quickly into flashover as well, propelling the fire out the front door and onto the porch.