Surveillance Video Shows Force of Seattle Blast

Seattle Mayor Ed Murray says 36 businesses were damaged in the early morning gas explosion in the Greenwood neighborhood. During a news conference next to the rubble, Murray said the city will help the region rebuild.

Seattle Fire Chief Harold Scoggins says he is proud of the way his firefighters put themselves in the right position as they investigated reports of a gas leak. He says their training kept them from getting killed when the explosion happened.

Puget Sound Energy spokesman Andy Wappler says they're supporting the investigation, but the cause remains unclear. It was not known if the problem came from inside or outside the building. He says gas lines are inspected every three years, but he didn't know when the pipes in the area had last been inspected.