Update, 8:35 a.m. Thursday, June 15: San Francisco police have identified the victims and gunman in Wednesday's attack at the UPS shipping facility at 16th Street and San Bruno Avenue.
Those who died, all UPS drivers, were:
- Wayne Chan, 56, San Francisco.
- Michael Lefiti, 46, of Hercules. In a profile, the San Francisco Chronicle says family and friends remember Lefiti as a man who "was always there" for others.
- Benson Louie, 50, San Francisco. The Chronicle profiles Louie as a "beloved volleyball coach."
Police identified the attacker, also a UPS driver, as Jimmy Lam, 38, of San Francisco. Lam reportedly filed a recent grievance citing excessive overtime. A union official familiar with Lam said, "I never knew Jimmy to not get along with people."
Original post (last updated 2:20 p.m. Wednesday, June 14): A UPS employee shot and killed three co-workers at the company's main shipping facility in San Francisco Wednesday morning before turning his gun on himself and taking his own life. Two others, also UPS workers, were wounded.
In a late-morning media briefing, San Francisco Police Department Assistant Chief Toney Chaplin said officers sped to the scene after receiving reports of gunfire at 8:55 a.m. at the UPS building -- which covers the block between 16th and 17th streets and Utah Street and San Bruno Avenue.
Chaplin said one police response team encountered the gunman, whom he said was armed with an assault pistol. When officers confronted the attacker, Chaplin said, he shot himself in the head. The man died after being taken to San Francisco General Hospital.
UPS spokesman Steve Gaut told The Associated Press the gunman was an employee who opened fire before drivers were sent out to do their normal daily deliveries.
Police said they had not determined a motive for the attack, but that it was not considered a terrorist incident.
The conditions of the two surviving victims, who were also UPS employees, was not immediately known.
Officer Tracy Green of SFPD's Bayview Station told KQED just after the incident unfolded that an active shooter was "down" at the scene and that officers were sweeping the UPS shipping facility.
Green said the shooter was found with a self-inflicted wound.
Dozens of police officers, including members of the SFPD's SWAT team armed with semi-automatic rifles, swarmed the area just before 9 a.m.
A UPS employee who asked that her name be withheld told KQED's John Sepulvado that she was in a break room when the shooting started.
“I heard 'boom, boom, boom, boom, boom,' and I’m thinking, 'OK, it’s either boxes falling or gunshots,' " she said. "And then I heard another boom, and then I hear someone screaming, 'Everybody run, everybody run.' ”
UPS driver Marvin Calderon said he was at his truck when he heard a series of shots. He told reporters he didn't see the shooting because his vehicle was between the shooter and him.
"I just started screaming, 'Get out! Get out! There's gunfire, gunshots. Go! Go!'" Calderon said. "And then everyone started running. It was too quick. Less than 30 seconds."
Calderon estimated he heard seven shots in an initial round of firing and that the gunman fired another five or six shots near the corner of 17th Street and San Bruno Avenue. In the hours immediately after the shooting, two bodies lay under yellow tarps at that corner.
Robert Kim, who runs an auto repair shop in the neighborhood, told the AP he heard at least five gunshots and saw UPS drivers running down the street screaming "shooter, shooter."
Hayward Cook, who described himself as a UPS human resources manager, told KQED he was interviewing people in a conference room when he heard five gunshots.
He said that as the shots came closer, he moved people into nearby offices to "hunker down."
Cook said he heard another series of five shots before the area fell silent and he escaped from the building with others.
In a statement, UPS said: "The company is saddened and deeply concerned about affected employees, family members and the community we share. Our thoughts and prayers are with all those touched by this incident. To assist our employees during this time, UPS has made professional counseling available."
Sen. Dianne Feinstein also issued a statement late Wednesday morning, one that recalled San Francisco's worst mass shooting -- 1993's 101 California Street attack, in which nine people died.
“I was heartbroken to learn that yet another senseless act of gun violence has marred our wonderful city," Feinstein said. "My heart goes out to the victims and their families, and to everyone affected by this despicable act. I can’t help but recall the 101 California Street shooting in 1993, when eight people lost their lives. Violence is never the answer, but the continuing scourge of gun violence is particularly disheartening."
This post will be updated. KQED's Holly Kernan, Ted Goldberg, Ryan Levi, John Sepulvado, Miranda Leitsinger and Adam Grossberg contributed to this report.