not sure of exact cause,, but.. that sounds very possible.
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ap update excerpt below from another site
San Diego hotel under construction damaged by apparent blast
http://www.bakersfield.com/119/story/449033.html
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UCSD Medical Center was treating 10 injured, said Dr. Irving Jacoby, attending emergency room physician. Three were in the burn unit, one with burns over 35 percent of his body.
“They talked about a bright light and an intense heat,” said Dr. Bruce Potenza of the hospital’s burn unit.
San Diego Deputy Fire-Rescue Chief Perry Peake said the blast appeared to be “some sort of mechanical failure or gas explosion.”
“We want to rule out all possibilities before making an official report, but we’re pretty confident that’s how it’s going to come out,” he said.
The blast happened in a “mechanical area” of the building containing gas, electric and other utilities, Peake said.
The blast damaged floors four through seven of the building, Mayor Jerry Sanders said.