CHICOPEE, Mass. (AP) — A diesel tanker truck rolled over and exploded Friday on a western Massachusetts interstate in a wreck that sent fireballs and thick black smoke billowing up and shut down the highway.

The truck driver, who was initially trapped in the cab, was hospitalized with critical burns.

Witnesses said more than a dozen people tried to free the man.

The fire engulfed three cars and pushed the truck partially off an Interstate 91 overpass, said Peter Judge, a spokesman for the Massachusetts Emergency Management Agency.