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CASPER, Wyo. — A 13-year-old Colorado boy was killed and his twin brother was seriously injured in a recreational vehicle crash in Yellowstone National Park.

Yellowstone spokeswoman Linda Veress says the rental RV crashed on South Entrance Road near Lewis Falls on Tuesday evening. KTWO-AM in Casper reports Nathaniel Ullom, of Elizabeth, Colorado, died at the scene, and his brother Phillip was flown to a hospital in Idaho.

The boys’ father was taken to a hospital in Jackson.

Veress says the RV was the only vehicle involved in the crash. No other information was released.