Two Oak Harbor women were killed in a single-car accident on State Highway 20 in Skagit County today.

Gail A. Wieldraayer, 59, and Lorna M. Wieldraayer, 84, were both seriously injured and airlifted to Harborview Medical Center in Seattle, where they each succumbed to their injuries, according to the Washington State Patrol.

Trooper Mark Francis said Gail Wieldraayer was driving a 2000 Ford Explorer east on the highway, went off the road on the right, struck a sign, crossed over Reservation Road, went through a ditch and struck a concrete wall surrounding a topsoil business.

The collision was reported at 10:39 a.m.

Trooper Mark Francis said the highway was shut down for about 20 minutes so that the women could be airlifted from the scene.

He said the cause of the accident is under investigation. Both women were wearing seat belts and intoxication is not suspected.