Mayor: Welding at site of big San Francisco blaze

SAN FRANCISCOSan Francisco fire investigators on Wednesday were looking into whether welding work was to blame for a massive blaze that barreled through an apartment building construction site, threatening nearby buildings, prompting evacuations and forcing officials to call in about half the city's on-duty firefighters to prevent its spread.

As fire crews doused hotspots in the charred remains of the block-long apartment complex, city officials said they narrowly avoided a catastrophe in an up-and-coming neighborhood near the San Francisco Giants ballpark.

"I think we're very lucky that the fire didn't jump anymore," Mayor Ed Lee said.

The exact cause of the fireone of the city's largest in recent yearswas under investigation, but fire officials were looking into preliminary reports that workers were doing torch work at the site shortly before the fire was reported around 5 p.m. Tuesday, Fire Chief Joanne Hayes-White said.

The five-alarm fire created a plume of black smoke that was visible for miles and led to the evacuation of nearby buildings, as more than 150 firefighters were called in to contain it. One of the walls of the burning building collapsed about an hour after the fire began.

The blaze also cracked windows on an apartment building, Strata at Mission Bay, across the street and sent an ember onto the roof of a University of California, San Francisco building in the neighborhood. Two firefighter suffered minor injuries.

The fire was fueled by wood frames and other materials at the site, Hayes-White said. Since it was under construction, the building also had no fire suppression systems.

"Our objective last night, which we were able to achieve, was to contain (the fire) to the building of origin," she said.

Fire officials did not have an exact estimate on the damage on Wednesday, but said the entire six-story building was considered a loss.

The Strata apartment building remained evacuated on Wednesday.

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Mayor: Welding at site of big San Francisco blaze