thi morning." updating you on an Interstate 81 wreck that's causing major backups in Botetourt County. Both northbound lanes are closed near the Lee Highway exit. You'll want to take Exit One-62 as a detour. There's a three-mile backup right now, but traffic is starting to move. Virginia State Police say they don't know of any injuries right now. Emergency crews there are responding to a call that a vehicle was on fire. We'll have more updates on wdbj7.com.