Gathering of Workers on Top of A Roof

11:10 a.m.A man who lives across the street from a San Francisco UPS warehouse where a gunman opened fire says he heard seven or eight shots fired quickly and saw workers running.

Raymond Deng, 30, a data scientist for a start-up company, said he looked out his apartment window Wednesday to see a group of UPS workers fleeing the building and shouting.

He says another group of about 10 workers assembled on the roof and held their hands up as police began to arrive. UPDATE | Neighbor says some UPS workers gather on roof