RUIDOSO, New Mexico (AP) — A small medical plane crashed outside Ruidoso, New Mexico, Thursday morning, killing all four people aboard, officials say.

The cause of the crash remains unknown according, according to Lincoln County Manager Jason Burns.

The flight departed from Roswell Air Center and was headed to Sierra Blanca Regional Airport, according to the Federal Aviation Administration. The FAA and National Transportation Safety Board will investigate.

A fire “associated” with the crash is estimated to be less than 5 acres (2.02 hectares), Burns said. The U.S. Forest Service is working with local agencies to suppress the fire.

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