A fiery pileup at a tunnel on Interstate 80 in southwestern Wyoming killed at least two people, seriously injured at least five others and shut down the highway.

The crash occurred at 11:37 a.m. under a snow-dusted hill in Green River, Wyo., according to the State Transportation Department. By 5 p.m., the tunnel, which leads traffic west on Interstate 80, had been evacuated and the scene had “been contained,” the department said in a statement.

Wyoming Highway Patrol troopers said that the crash involved semi-trucks and passenger vehicles, and added that the strong heat was causing tires to explode