One person is dead and another was seriously injured in a two-car crash on South Whidbey tonight, state police have confirmed.

Details of the accident are not yet clear, but the collision happened around 8:30 p.m. on Highway 525 just east of Coles Road. One vehicle is believed to have crossed the centerline and struck another head on.

The identities of the those involved have not yet been released.

The state route was closed at Craw and Maxwelton roads. An emergency landing zone was set up on the highway and an air ambulance landed and picked up one patient. Its destination was not immediately known.

A Washington state trooper said at 9:30 p.m. the road would likely be closed for at least another two hours, as the scene is processed by Highway Patrol accident technicians.