OAKLAND -- One person was hospitalized after gunfire broke out on a freeway early Sunday morning, police said.

The shooting happened about 2:40 a.m. on westbound Interstate 580, just east of the Interstate 80 interchange, police said. Nobody was struck by the gunfire, but the driver of a red Cadillac Escalade was take to Highland Hospital in Oakland with cuts to his face from shattered glass after the car was hit, police said.

According to California Highway Patrol Officer Daniel Hill, the Cadillac was in the number three lane when two vehicles sped up to it from behind. One of the vehicles bumped the Cadillac, while a sedan pulled alongside. Someone inside the sedan rolled down a window and began firing, Hill said.

Three passengers were in the Cadillac, but none were injured, Hill said.

Investigators from the Oakland Police Department were on the freeway for hours after the shooting, and traffic was diverted around the area. The freeway was reopened to traffic by 7 a.m. Sunday, police said.

Investigators have not announced a motive for the shooting.

Contact Rick Hurd at 925-945-4789. Follow him at Twitter.com/3rdERH.