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Police trying to determine motive behind shooting that killed 3 at UPS facility

Wearing a UPS uniform, a man walked into a company facility in San Francisco Wednesday morning and opened fire, killing three people and wounding two before shooting himself, authorities said.

San Francisco Police Assistant Chief Toney Chaplin said during a press conference that officers who arrived on the scene encountered the suspect, who has not been identified, and he "put the gun to his head and discharged the weapon," dying instantly. Investigators do not yet know if the shooter was a current or former employee, and they are interviewing "dozens and dozens" of witnesses in an attempt to determine the motive, Chaplin said.

UPS said 350 people work at the facility, and the company is "saddened and deeply concerned about affected employees, family members, and the community we share." San Francisco Mayor Ed Lee called the shooting a "senseless act of violence" that will be "felt in every community served by these committed employees."