Updated at 3:46 p.m.
The northbound lanes have reopened.
Updated at 2:18 p.m.
U.S. Park Police said a tree fell and blocked northbound lanes on the George Washington Memorial Parkway Friday afternoon.
Authorities said the tree fell south of the Virginia State Route 123 interchange around 12:50 p.m.
Northbound traffic was being diverted onto Spout Run Parkway. Officials urged drivers to seek alternate routes.
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— Trenholm Boggs (@TrenholmBoggs) July 18, 2014