Police search an area where a workplace shooting occurred that killed one person and wounded several others at Valley Protein, formally known as Apple Valley Farms Tuesday, Nov. 6, 2012, in Fresno, Calif. Police say a parolee who worked at the Fresno chicken processing plant opened fire at the business on Tuesday, killing one person and wounding three others, before shooting himself. Police Chief Jerry Dyer said they didn't know what prompted the attack by 42-year-old Lawrence Jones midway through his shift at Apple Valley Farms. Other workers told police he did not appear to be himself when he arrived at the plant for work. (AP Photo/Gary Kazanjian)
An unidentified woman cries as she's rushed into a car after learning of a workplace shooting Tuesday, Nov. 6, 2012, in Fresno, Calif. A parolee who worked at a California chicken processing plant opened fire at the business on Tuesday, killing one person and wounding three others, before shooting himself, police said. (AP Photo/Gary Kazanjian)
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Updated at 1:51 p.m. PST
FRESNO, Calif. (AP) — A parolee who worked at a California chicken processing plant opened fire at the business on Tuesday, killing two people and wounding two others, before taking his own life, authorities said.
Police said they didn't know what prompted the attack by Lawrence Jones, 42, midway through his shift at Apple Valley Farms, although other workers told police he did not appear to be himself when he arrived at the plant for work.
"It is difficult to say at this point if in fact there was a specific target that Jones was looking for," Police Chief Jerry Dyer said. "There was something that must have provoked this incident, perhaps that occurred today, or maybe was building up to today."
Jones has an extensive criminal history dating back into the 1990s, Dyer said without elaborating.
Police said they had Jones' home on lockdown and were searching to see if there were any other victims.
Jones arrived at work just before 5 a.m. About three-and-a-half hours into his shift, he pulled out a handgun and began firing, Dyer said.
About 30 employees witnessed the shooting, and there were a total of 62 people at work when the gunfire started, police said.
"We have a lot of work ahead of us. We have at least 30 witnesses that we need to interview," Dyer said.
Officers found Jones with a gunshot wound to the head and a 32-year-old woman bleeding from a wound to her lower back outside the business. She was in stable condition, Dyer said.
Three other people were found shot inside. One was pronounced dead at the scene. Jones and another victim were pronounced dead later.
The company was established in 2005, according to online business records. A call to the company went to a voicemail recording that said "due to an emergency we are closed for the day."
A woman who answered the phone at a listing for CEO Durbin Breckenridge and identified herself as his wife said she would pass a phone message to him.
News media and onlookers were kept several blocks from the plant, as police used yellow tape to block access. Dozens of officers swarmed the area.
Joe Martinez, 45, told the Fresno Bee that he was in the drive-thru lane of a fast-food restaurant when he heard a loud pop that he initially thought was a car backfiring.
Then he looked to the north and saw a man on the ground with two people standing over him.
"It's the last thing you expect to see," Martinez said. "It's very upsetting."
Associated Press writers Jason Dearen and Terence Chea contributed to this report from San Francisco.