This story will be updated with additional material and information on this developing news event.
Police responded to a report of an active shooter around 8:55 a.m. local time (11:55 a.m. ET) at the UPS San Francisco Customer Center, a couple of blocks east of Franklin Square. He said he could not say how many patients were taken to the hospital or give their conditions.
The gun violence there erupted hours after another, unrelated mass shooting at a charity baseball practice in the suburbs of the nation's capital left a congressman and several others wounded before the assailant was killed by police. The source says that one of the people who was shot is the suspected shooter. He said authorities won't release the names of those killed or the gunman until their next of kin are identified.
The gunman was injured in a shootout with police and later died in police custody. The company said four employees were involved.
The victims, like the gunman, were also company drivers, said Steve Gaut, head of investor relations at UPS.
Auto shop owner Robert Kim said he brought cars inside and shut the gate Wednesday.
Deng watched from his window in the Potrero Hill section of San Francisco as workers fled the building shouting.
A long column of two rows of UPS employees were escorted out of the building by armed police officers, KPIX-TV reported. They walked away calmly with emergency vehicles nearby and gathered nearby outside a restaurant.
The shooting Wednesday led to a massive police response and a shelter-in-place warning for the surrounding area.
- San Francisco Police (@SFPD) June 14, 2017#SFPD is conducting a building search.
"UPS confirms there was an incident involving employees within the company's facility in San Francisco earlier this morning", the statement read. The incident led to rapid action by the police and the locals were asked to avoid the crime area.