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Officials: Massive San Francisco fire last month that forced evacuations accidental, not arson

San Francisco fire officials say a massive blaze that barreled through an apartment building construction site last month was accidental, not arson.

In a report released Tuesday, investigators say the five-alarm fire on March 11 in the city's Mission Bay neighborhood began when a hot or smoldering object ignited wood that was part of the building's structure.

Fire spokeswoman Mindy Talmadge said a more detailed report that could explain what caused the blaze is expected in the next couple of weeks.

Fire officials said a day after the fire that they were looking into preliminary reports that workers at the block-long site were doing torch work.

The fire threatened nearby structures and prompted evacuations as firefighters worked to prevent its spread through the neighborhood.

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