JUNEAU, Alaska (AP) — A charter aircraft carrying eight people crashed at a remote radar site in western Alaska on Thursday, killing all on board, the U.S. military said.

The crash happened near Cape Newenham Long Range Radar Site Airport, approximately 450 miles (725 kilometers) west of Anchorage, Alaska.

“This is a devastating loss for our military family and the communities we serve,” U.S. Air Force Lt. Gen. Robert Davis, commander of Alaskan Command, the Alaskan North American Aerospace Defense Command Region and Eleventh Air Force, said in a statement.

The Pacific Air Forces Regional Support Center manages the radar site. It’s part of a network of remote radar sites that tracks aircraft operating in Alaska’s airspace and along its borders, the statement from Alaskan Command said.

The statement did not provide details on the specific work the individuals were doing. It referred to the plane involved as a “civilian-contracted aircraft.”

Davis described those on board as “dedicated professionals carrying out a vital mission in a demanding environment. Our absolute priority right now is providing unwavering support to their families, friends and teammates during this devastating time. We are profoundly grateful for the swift and tireless response of our search and recovery professionals.”

Clint Johnson, the National Transportation Safety Board’s Alaska region chief, said earlier Thursday evening that two pilots and six passengers were on board.

The plane, a Cessna 441, had taken off from the Ted Stevens Anchorage International Airport and was headed to Cape Newenham, the Federal Aviation Administration said in a statement. The crash happened about 12:15 p.m. Thursday west of Cape Newenham.

U.S. Sen. Lisa Murkowski of Alaska posted online that the flight was operated by Security Aviation, an Anchorage-based charter company.

An email was sent to the company Friday morning seeking comment.

“I join Alaskans in offering condolences as we learn of the plane crash in Cape Newenham,” Murkowski posted Thursday night. “I’ve traveled extensively with Security Aviation throughout Alaska, and have met many of their experienced pilots. I appreciate the U.S. Coast Guard, NTSB, Alaska State Troopers, and the Rescue Coordination Center for responding to the site. Alaska is praying for those on board, their loved ones, and the team at Security Aviation.”