Several people were injured when an active shooter let loose a barrage of gunfire Wednesday morning at the UPS building in the Potrero Hill area of San Francisco, prompting a massive police response and a shelter-in-place warning for the surrounding area, officials and witnesses said.

Multiple victims were being treated at San Francisco General Hospital, the extent of their injuries unknown, according to hospital spokesman Brent Andrew. 

Shooting at UPS building in SF leaves multiple victims wounded – SFGate

sigh…