One person was killed Sunday night in a two-vehicle traffic accident on westbound state Highway 4 just east of the Port Chicago Highway interchange, the California Highway Patrol said.
The accident was reported at 8:28 p.m. Sunday. One of the cars involved veered off the freeway and down an embankment near where the abandoned Concord Naval Weapons Station railroad tracks pass under the freeway.
The CHP couldn't provide details about the victim, or whether the person who died was in the car that went down the freeway embankment.
It appears that no one else was injured, the CHP said and all lanes were reopened by 10:50 p.m.