A U.S. Army Black Hawk helicopter carrying four service members crashed during a training mission near Joint Base Lewis-McChord in Washington state late Wednesday, sparking a wildfire and drawing a large emergency response, officials said.

The MH-60 helicopter from the Army's 160th Special Operations Aviation Regiment went down in the Summit Lake area west of Olympia, according to Army officials. The soldiers' conditions have not been released as of 7:20 p.m. ET Thursday. The cause of the crash remains under investigation.

"This remains an active, ongoing situation," the Army said in a statement. Army spokesperson Ruth Castro told The Associated Press that the incident was being treated as a search mission and that the "most professional and skilled" responders were addressing the scene.

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