GARDEN GROVE, Calif. (AP) _ A gunman sprayed an auto parts store with bullets Monday, killing two people and wounding four others.

It was unclear whether the victims were employees, customers or bystanders, Sgt. Todd Elgin said. Police said the motive was not known.

The gunman opened fire about 1 p.m. outside Robotek, which sells performance car accessories, then burst inside and resumed the attack. Witnesses said the young man fled from the store in a gray minivan and another man may have fled with him.

Three people were in critical condition and undergoing surgery.

An 18-year-old man was shot in the back, a 17-year-old person was hit in the neck and grazed in the left hand, and a 48-year-old person had several gunshots wounds to the neck, cheek, arm, thigh and buttocks, said a hospital spokeswoman.

A 15-year-old boy was shot in the ankle and was in good condition.

Garden Grove is about 35 miles southeast of Los Angeles.