GUNNISON COUNTY, CO. (THECOUNT) — Mark Hendrickson, 46, Alan Hendrickson, 15, and Chase Hendrickson, 13, all of Rifle, Colorado, were killed Saturday when a small plane crashed in a remote area near Swampy Pass in Gunnison County, authorities said.

First responders were dispatched to the crash site on Colorado’s Western Slope after receiving a 911 alert at approximately 9:20 a.m. Saturday, Oct. 24. When emergency crews reached the remote location, they found all three occupants dead.

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The Gunnison County Coroner’s Office identified the victims as the three Rifle residents. Their relationship to one another has not been confirmed in the information provided.

The crash was reported in the area of Swampy Pass, near Ohio Creek Road, north of the town of Gunnison. The remote terrain complicated responders’ access to the site.

The Gunnison County Sheriff’s Office, the National Transportation Safety Board and the U.S. Forest Service are investigating the crash. Authorities have not announced what caused the aircraft to go down.

Investigators are expected to release additional information as it becomes available. The circumstances leading up to the crash remain under investigation.

The fatal crash occurred near Swampy Pass in Gunnison County, in the mountainous region of western Colorado. The area is north of Gunnison and part of the state’s Western Slope.

Google Maps: Swampy Pass, Gunnison County, CO (approximate crash area)

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