BILLINGS, Mont. (AP) — Authorities say a motorcycle crash on the popular Beartooth Highway outside Yellowstone National Park killed a 70-year-old man and injured his 69-year-old passenger.

The Montana Highway Patrol says the motorcycle was driving north on U.S. Highway 212 near the Montana-Wyoming state line Saturday when it missed a sharp left curve. The motorcycle went off the side of the road and into a dry creek bed, and both driver and passenger landed on the rocks.

The driver and his passenger weren’t named. Authorities said they are from Havre.

The passenger was airlifted to a Billings hospital. Her condition wasn’t immediately known.

Authorities say they were wearing helmets and driving a 1996 Harley Davidson motorcycle.

The scenic Beartooth Highway climbs along sharp switchbacks to nearly 11,000 feet.