LOS ANGELES—Five members of a Downey family were shot — three fatally — in a bizarre shooting that started at the business they owned and ended at their home a few blocks away.

Authorities said they don’t know the motive for the attack and said they are searching for the gunman, who allegedly fled in a 2010 black Camaro stolen from one of the victims.

Witnesses described seeing family members wounded and bleeding outside both properties, including one woman who appeared to be shot in the head.

“The family was targeted for a specific reason,” Downey police Lt. Dean Milligan said. “But we don’t know what that reason was yet.”

The first sign of trouble came at 11:12 a.m. when someone called 911 about a shooting at the business, United States Fire Protection Services. When officers arrived three minutes later, they found a man and a woman dead and another woman wounded.

At 11:17 a.m. police received a second call from the home of the business owner, about two blocks away. There, they found another dead woman and a wounded 13-year-old boy.

The boy told police he didn’t recognize the gunman, Milligan said. The suspect was described as a 30-year-old black man about 6-feet tall and 230 pounds. He was last seen in the Camaro, which had the license plate 6LEA010.

Grace Mendez said she saw the teenager near the business as she drove down the street.

“He was screaming, ‘Oh my God, oh my God!” Mendez, 33, said. “And then I saw that he was shot in the shoulder blade and stomach.”

As news of the shooting spread, worried family members hurried to the business, desperate for answers.

“My wife works in there!” yelled a man in a white T-shirt who approached the police tape around 1 p.m. “I need to know if she’s OK!”