FREDERICK COUNTY, Va. - Police and fire crews are attempting to round up cattle after a tractor-trailer overturned on Interstate 81 in Frederick County, according to Virginia State Police.

The big rig crashed at about 5:28 a.m. Monday as winter weather blew through Virginia.

"The driver suffered minor injuries," Virginia State Police spokeswoman Corinne Geller said. "The truck was loaded with cattle, which have broken free of the trailer and are wandering around the interstate. Police and fire crews are on scene rounding up the cattle. Delays and road closures continue in this area."

Approximately 33 cattle were in the truck when it ran off the road and overturned. Six cattle were killed in the crash.

"Troopers have gone to great lengths to look out for the welfare and humane treatment of the cattle involved in the crash," Geller said. "Of the 33 cattle riding in the trailer, six escaped the damaged trailer.

A veterinarian is helping police assess the conditions of the injured cattle.

The crash was reported on Interstate 81, at mile marker 300 near the I-66 interchange. It was one of over 200 crashes and disabled vehicle calls Virginia State Police responded to around the Commonwealth since midnight Monday morning.

This is a developing story, so anyone with additional information or photos can submit them here.