Update at 4:30 p.m. — The “all clear” has been given and roads have been opened back up.

Police are shutting down Washington Boulevard in both directions between I-395 and Route 110.

Initial reports suggest the road is being closed at the request of the Pentagon due to a suspicious package at the 9/11 Memorial. The Arlington County bomb squad is assisting with the incident.

The county is advising motorists to seek an alternate route.