Six people were killed in a helicopter crash in West Virginia‘s Logan County on Wednesday evening, according to US media reports citing authorities. The identities of those killed have not been disclosed so far.

Logan County Office of Emergency Management’s deputy director Sonya Porter said that the helicopter came down on Route 17 near Blair Mountain — a mountainous area also called Kelly Hollow.

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The cause of the helicopter crash is yet to be determined. “At the time the crash occurred, I think the weather was clear”, Porter said, according to a New York Times report.

What do we know so far?

-Those who were on board the helicopter were not local residents, according to Logan Emergency Management chief of operations Ray Brant.

–The Federal Aviation Administration, which will also investigate the incident, disclosed the make of the aircraft. It was a Bell UH-1B helicopter manufactured in 1962. The helicopter’s tail number was N98F, Brant said.

-The crashed helicopter was owned by Marpat Aviation, a flying school based in West Virginia. The institution was holding an annual reunion this week. Its website said that people could book a slot for themselves and fly the helicopter without being a pilot, New York Times reported.

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-The website further said that anyone who wanted to fly the aircraft was required to pay a $250 donation, which would also cover the cost of the fuel. Others who wanted a ride could pay a relatively smaller donation.

-The United States National Transportation Safety Board and the Federal Aviation Administration will jointly probe the helicopter crash.

-A woman who witnessed the helicopter crash told New York Times: “I went up to the helicopter, but the fire was just so hot, so intense.”