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MISSOULA, Mont. - A twin-engine plane crashed at Lost Trail Ski Area Tuesday evening near the Montana-Idaho state line.

Federal Aviation Administration spokesman Allen Kenitzer says preliminary information indicates the plane was a Grumman G-21A with only the pilot on board.

Ravalli County Sheriff Chris Hoffman said the plane is larger than initially thought -- it is a twin-engine plane.

Officials have not yet determined who owned the plane, where it was coming from or who was on board.

People attending a meeting at Lost Trail Ski Area said they heard a massive crash at about 5:30 p.m. and ran to see what happened.

One witness said the plane dropped hard and flat, right out of the sky. Witnesses also said it looked like flames immediately engulfed the plane.

Lost Trail straddles the Montana and Idaho state line. It's about 95 miles south of Missoula.

National Transportation Safety Board and FAA officials will investigate Wednesday.

Copyright 2014 by KECI, KCFW, KTVM. The Associated Press contributed to this report. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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