The Jefferson County Sheriff’s Office said it responded to a helicopter crash Sunday afternoon in a remote area in the northwestern part of the county.

Three passengers were aboard the privately owned aircraft at the time of the incident, Sheriff Tom Grimsrud said.

The status of the passengers on the aircraft and further details will be released in coordination with the National Transportation Safety Board (NTSB) and FAA, he said.

The sheriff said the incident remains under investigation.

Boulder Ambulance, St. Peter’s Ambulance, Elkhorn Search and Rescue, Basin Volunteer Fire Department, Boulder Volunteer Fire Department and the U.S. Forest Service assisted with the incident, Grimsrud said.

No further information was immediately available.