Virginia State Police and Arlington Fire units responded Wednesday to a multi-vehicle crash on the eastbound lanes of I-66 at Washington Boulevard.
All eastbound lanes were shut down. Traffic was diverted onto Route 29, News4 partner WTOP reports. You can track delays on this traffic map.
A miles-long backup was building toward the Dulles Toll Road and the Beltway.
Virginia State Police tell News4 there are no serious injuries, so once the vehicles can be towed from the scene the highway will reopen.