ROANOKE COUNTY, Va. – UPDATE
This crash has been cleared.
As of 6:30 a.m., the northbound left lane and right lane are closed.
Traffic is backed up for about 2 miles.
A crash has closed all I-81N lanes in Roanoke County, according to the Virginia Dept. of Transportation.
Authorities say the crash happened near mile marker 136 around 5:30 a.m.
Stay with 10 News as this breaking news story develops.