Correction: The San Francisco Chronicle is now reporting that it was a five-alarm fire, which required more than 150 firefighters:
First 5-alarm fire in SF in several years, chief tells @jvanderbeken
— Vivian Ho (@VivianHo) March 12, 2014
— NBC Bay Area (@nbcbayarea) March 12, 2014
— KCBS 740 AM/106.9 FM (@KCBSNews) March 12, 2014
5th ALARM: rare 5th alarm called bringing crews in from entire city. Crews retreat to safety as collapse begins. No injuries reported.
— Emergency_In_SF (@Emergency_In_SF) March 12, 2014
— Nikki Larue (@nikkaylarue) March 12, 2014