Updated: 11:32 a.m.

An accident involving a sewage truck shut down eastbound Route 50 in Arlington for about three hours Sunday morning and caused a minor hazmat event.

Traffic traveling in both directions on Route 50 at Fillmore Street was down to a single lane by 11 a.m. as police and fire officials attempted to contain the sewage spill. Police officials said the roads would be cleared soon.

Because of the spill, police officials have advised Arlington residents and their pets to avoid the waters of South Four Mile Run from Columbia Pike south to the county line until Wednesday.

Staff from the Department of Environmental Services have determined that the waste from the spill will enter Four Mile Run south of Interstate 395 via Lower Long Branch Run and will not affect any of the parks, streams or dog parks along Four Mile Run north from Interstate 395 to Columbia Pike. Jenny Dean and Barcroft Parks will not be effected.

Original post, 8:15 a.m.:

Arlington County reports Route 50 eastbound is closed at Fillmore Street because of an accident that has also caused a minor hazmat event. The road is expected to be closed for several hours.