The incident occurred near the Sullivan and Washington county line at about 1:30 p.m.
According to Tennessee Highway Patrol Trooper Nathan Hall, a convoy of motorcyclists was traveling to Washington, D.C., as part of the annual "Ride to the Wall."
The THP said one motorcycle collided with a Walmart tractor-trailer. That motorcycle was dragged by the trailer, igniting a fire that engulfed it.
More about the crash from our partners at the Kingsport Times News.