U.S. Highway 191

A total of 13 bison were killed.

Workers continue to cleanup the gas spill after a fuel truck rolled over on U.S. Highway 191 in Yellowstone National Park.

A 96-year-old Idaho man was killed in a single-vehicle rollover north of Rock Springs Friday afternoon.

No injuries were reported.

The investigation is being led by Yellowstone National Park.

The Highway Patrol is investigating speed, passing in a no passing zone and lack of helmet use as contributing factors in this crash.

Two men died in a two-vehicle collision in southwestern Wyoming on Monday afternoon, according to a news release from the Wyoming Highway Patrol.