A truck carrying more than 11,000 pounds of explosives wrecked on southbound U.S. 220 Thursday morning, snarling traffic heading into and out of Roanoke for four hours during the morning rush hour.

No one was seriously hurt in the wreck, and no explosives spilled onto the road. But authorities in Southern Roanoke County blocked a 112-mile stretch of the highway from about 6 to 10 a.m. between Yellow Mountain Road and Buck Mountain Road.

The wreck caused about 15 gallons of acetic acid, another substance aboard the truck, to spill onto the roadway.

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