UPS Shooter Armed With Stolen Guns, Appeared to Target Victims

San Francisco police on Friday said the UPS driver who shot and killed three colleagues last week was armed with two stolen guns and appeared to target his victims.

Commander Greg McEachern told a news conference Friday that investigators have not yet determined Jimmy Lam's motive, but "the shooting appeared purposeful and targeted."

The 38-year-old Lam, who had prior arrests for nonviolent crimes, shot and killed three fellow drivers and wounded two others before killing himself in front of police in the June 14 shooting rampage at a San Francisco UPS warehouse.

McEachern said Lam was armed with two stolen weapons.

He described one as an assault pistol stolen in Utah. Lam fired 20 of 30 rounds from that gun during the shooting. Lam also had a semi-automatic handgun stolen from Napa County and a box of ammunition.

McEachern said it was not known who stole the weapons or how Lam got his hands on them.

An investigation into the shooting spree is ongoing. Investigators are combing through a computer, journal and phones found at Lam's home.

NBC Bay Area's Jean Elle contributed to this report.

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