I-81 back open after crashes in Montgomery County

MONTGOMERY COUNTY, Va. (WDBJ) - UPDATE: All crashes have been cleared and northbound I-81 in Montgomery County is back open, according to Virginia State Police.

ORIGINAL STORY: I-81 northbound in Montgomery County will be blocked much of Monday because of a series of crashes, according to Virginia State Police.

Police say there are four crashes blocking the interstate as of 2:15 p.m. The crashes are at the 120 mile marker, with as many as 20 tractor trailers and cars involved. There is no word so far regarding injuries.

Units on scene say there will be an “extended period of time” before the road is open, according to police. VDOT has set up a detour at mile marker 118 to route traffic around the crashes.