WALNUT CREEK — Police here are searching for a man who opened fire on a car that had just left a concert at the Concord Pavilion on Sunday night, striking the woman driver and a man in the passenger seat, police said.

The two victims were taken to John Muir Medical Center in Walnut Creek for treatment but their conditions were not available late Sunday night, police said.

Their names and ages were not released.

Police are looking for a black man in his early to-mid 20s, about 6 feet to 6 feet 2 inches tall with a medium build, wearing a black three-hole mask, a T-shirt and blue jeans. Police said he was armed with a semi-automatic handgun and driving a light colored four-door sedan, possibly a Honda.

At shortly before 8 p.m. Sunday, witnesses said both the suspect and the victims were driving their cares west on Ygnacio Valley Road approaching a red light at Oak Grove Road when the suspect pulled up alongside the victim’s car and fired into the front passenger seat.

The suspect then got out of his car and fired numerous times into the victim’s white four-door Mercedes, striking both people, police said. The suspect drove north on Oak Grove Road, police said.

Police said the victims had just left the Concord Pavilion, where KBLX’s Stone Soul Concert featured Gladys Knight, The O’Jays, Freddie Jackson, Faith Evans, and the S.O.S. Band, according to the venue’s website.

It was not clear late Sunday if the suspect and the victims had a fight at the concert or in the parking lot before the shooting.

Anyone with information about the shooting should call the Walnut Creek Police Department at 925-943-5844.

Follow Kristin J. Bender at Twitter.com/kjbender.