[This post has been updated]
Falling rocks have blocked northbound George Washington Parkway north of Spout Run Parkway, according to Arlington County.
Officials said all northbound lanes are blocked. Traffic is being diverted to Spout Run Parkway to Interstate 66 westbound.
Drivers are urged to avoid the area and pursue alternate routes, including Interstate 66, Lee Highway, Canal Road and Spout Run Parkway.
Officials estimate the lanes will be closed until at least 10 p.m.