Truck wreck, hazardous materials spill snarled Inner Loop traffic on Capital Beltway in Md.

Tractor-trailer after hitting retaining wall on Inner Loop. (Photo: NewsChopper 7)

WASHINGTON (WJLA) - A tractor-trailer wreck and hazardous materials spill shut down the Capital Beltway in Maryland for several hours on Thursday, backing up mid-day traffic for nearly 10 miles at one point.

The spill occurred when the tractor-trailer hit a sound wall along the Inner Loop near New Hampshire Avenue around 10 a.m.

Police said two other vehicles were also involved in the crash.

As hazmat crews worked to clean up the spill, police had to divert Inner Loop traffic onto U.S. 29/Colesville Road in Montgomery County.

While three of four lanes were cleared and reopened by about 3 p.m., officials said traffic backups could linger through the afternoon rush hour.