SANTA FE SPRINGS, Calif. (AP) _ An employee opened fire at his plastics company today after arguing with a coworker, killing one man and wounding five other people, authorities said. He later apparently shot himself.

Daniel S. Marsden pulled out a gun at Omni Plastics Co. around 10 a.m. and opened fire, then fled in a car, said Chuck Drylie, a Whittier Police Department spokesman.

A man believed to be Marsden later shot and critically wounded himself on a South Central Los Angeles street, Drylie said. A witness saw him put a gun in his mouth and pull the trigger, he said.

The suicide attempt came less than two hours after the workplace shooting.

``First I thought it was a car backfiring and the next thing you know I heard all this pop, pop sound and then he ran through the office and started shooting, too,'' employee Cindy Mora told KTLA-TV.

The motive for the shootings wasn't known. Marsden, about 38, worked at the company as a quality control inspector.

``He got into an argument with a fellow employee, a gun was then produced and he started firing indiscriminately throughout the building,'' Drylie said.

A 45-year-old man was shot in the chest and killed and five other people, including one woman, were in serious to critical condition with bullet wounds, he said.

Paramedics treated the wounded in the Omni Plastics parking lot before taking them to hospitals.

Santa Fe Springs and neighboring Whittier are about 10 miles from downtown Los Angeles.