A UPS employee opened fire at a San Francisco package delivery facility on Wednesday, killing three employees and then himself as officers closed in, police and the company said.
San Francisco assistant police chief Toney Chaplin said a news conference that two others were wounded in the shooting that prompted a massive police response in downtown San Francisco.
Police have not determined a motive. Chaplin said that the shooter was armed with an assault pistol and put the weapon to his head and pulled the trigger when police found him.
A UPS statement said the shooter and all the victims were employees. Spokesman Steve Gaut told The Associated Press that the gunman opened fire inside the facility before the drivers were sent out for their daily deliveries.
Neighbors said they heard up to eight rapid gunshots.
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