4:36 p.m. Update:

The crash has cleared and westbound I-66 has reopened at the Beltway. Expect some delays to linger.

Earlier:


(Screenshot at 3:40 p.m.; courtesy of www.trafficland.com.)

An accident on westbound Interstate 66 is blocking all lanes before the Capital Beltway, according to Fairfax County. Traffic is backed up east of Broad Street/Route 7. Expect major delays and avoid I-66 if you can help it.

Mark Berman covers national news for The Washington Post and anchors Post Nation, a destination for breaking news and stories from around the country.