Officials have identified the three men killed after a UPS driver opened fire during a meeting at company warehouse in San Francisco.
San Francisco's chief medical examiner identified the victims as 50-year-old Benson Louie and 56-year-old Wayne Chan, both of San Francisco; and 46-year-old Michael Lefiti, of Hercules.
Police say the three UPS drivers were killed by 38-year-old Jimmy Lam, who fatally shot himself in the head in front of officers.
A motive in the killings has not been determined.
A union official says the gunman who shot and killed three people at a UPS warehouse in San Francisco had filed a grievance complaining that he was working excessive overtime.
Joseph Cilia, an official with a local Teamsters Union, says Jimmy Lam's grievance filed in March requested that UPS relieve him of working overtime going forward.
Still, Cilia says Lam wasn't angry, and he could not understand why he would open fire on his colleagues at a morning meeting on Wednesday.
Cilia says Lam targeted three fellow UPS drivers. Cilia says two other drivers who were wounded have been released from the hospital and will be OK.
Lefiti's cousin, Bob Toia, told the San Francisco Chronicle that Lefiti was devoted to his wife, family and kids.
Isaiah Miggins, a co-worker of Lefiti's at UPS, said Lefiti was a big man, but humble and always happy.
By late afternoon, friends had set up a memorial to Lefiti with flowers and balloons at a local supermarket near the UPS warehouse.
A San Francisco woman said she was riding a bus to work when she saw a group of workers streaming out of a UPS facility where an employee opened fire.
Jessica Franklin said the workers started banging on the bus when it made a stop Wednesday. She said they ducked as they boarded and told the driver to "go, go, go." And the driver did.
Franklin says the workers were screaming and crying and others were calling family members to tell them they were safe. She described the scene as chaotic.
The bus driver then stopped to let the workers out.
Marvin Calderon told San Francisco Bay Area news station KNTV that he heard five to six gunshots and that he recognized the gunman as a fellow employee, but he did not know him personally.
Calderon said he saw someone get shot in the head and he said he believed all the victims were drivers.
He said he ran away as fast as he could.
Authorities say the shooter was armed with an assault pistol when police found him.
San Francisco Assistant Police Chief Toney Chaplin told reporters that officers found wounded victims and brought them to safety Wednesday. When they found the gunman, he put the weapon to his head and shot himself.
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.
Deng says he "saw police officers go up from the ramp and then storm the buildings."
A witness says he heard at least five gunshots and saw UPS drivers running down the street screaming "shooter, shooter."
Auto shop owner Robert Kim says he brought cars inside and shut the gate Wednesday. He reopened after he saw police had blocked off an area around the UPS building, which is about a block from his shop.
The shooting led to a massive police response and a shelter-in-place warning for the surrounding area.
The building is located in the Potrero Hill, which is about 2 ½ miles from downtown San Francisco.
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