Sep 10, 2010 3:51 PM by Bea Karnes, News First 5
A California fire official says a quarter of the homes burned an enormous blaze sparked after a gas line ruptured are still too hot to search.
San Bruno Fire Chief Dennis Haag said crews are going door to door in the neighborhood near San Francisco.
At least four people were killed in the explosion and dozens more injured. Authorities say there could be more casualties.
Haag said they're still not able to access the site of the ruptured gas line because it's covered with water. Police are blocking people from approaching the burn area, saying it's being treated as a crime scene.
Pacific Gas and Electric President Chris Johns says crews still haven't been able to determine the cause of the rupture or the ensuing blast because they can't get close enough.