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CUPERTINO, Calif. — Authorities are searching door to door with guns drawn in a neighborhood about 5 miles from the Northern California quarry where a gunman killed two and wounded six at a morning meeting.

NBC Bay Area

An official holds a photo of the shooting suspect, identified as Shareef Allman of San Jose, Calif.

The search in Sunnyvale was one of several under way Wednesday morning as authorities sought 45-year-old Shareef Allman, who they say opened fire around 4 a.m.

Allman also is suspected of wounding a woman in an attempted carjacking in Cupertino more than two hours later.

Cupertino schools are on lockdown or closed as the search continued.

Santa Clary County Sheriff's Lt. Rick Sung said Allman was at the routine safety meeting, became disgruntled and left. He said Allman then returned and started shooting people.

Authorities are still searching the quarry for possible victims or workers still in hiding.

Allman, from San Jose, reportedly was carrying a 9mm handgun and a rifle.

Woman later shot near workplace
The suspect left the facilities after firing shots at a daily safety meeting at the plant, KNTV reported. He then attempted a carjacking at the nearby Hewlett-Packard parking lot, shooting a female driver in the leg. He did not manage to get the car from her.

The victim was taken to the hospital. Her condition was unknown, according to The Associated Press.

Officials ordered a lockdown for elementary schools in the vicinity of the manhunt, reported KTVU-TV.

In nearby Sunnyvale, another injured person was found in a parking lot, and police and SWAT teams were planning on storming a Sunnyvale home, reported KNTV, but it was not clear if either was connected to the workplace shooting.

Allman is described as African American, 5'11'', and 260 pounds, with numerous tattoos, according to KNTV.

Allman works as a loader operator at Permanente Quarry, reported KTVU.

"The only reports we have right now is that he was disgruntled and he was unhappy. Whether it was work-related or home-related, we don't know at this point," said Santa Clara County Sheriff's spokesman Jose Cardoza.

Allman has a minor criminal record, consisting of driving with a suspended license and a 1992 misdemeanor charge for forgery, reported The San Jose Mercury News.

Permanente Quarry, owned by Lehigh Southwest Cement Company, is a limestone and aggregate mining operation and cement plant located in the foothills above Cupertino.