Three tractor trailers involved in crash on I-81

A major accident snarled traffic on Interstate 81 northbound in southwest Virginia. The crash involving three tractor trailers happened about lunchtime near Natural Bridge.

It's under an overpass, which is complicating efforts to clear the scene. One lane is now open, but traffic is backed up for miles.

There was an earlier accident about two miles away, this one southbound. State Police say the chain-reaction crash began with a jack-knifed tractor trailer, then caught up six other tractor trailers and three other vehicles.

That shut down both southbound lanes for several hours.