NTSB lead investigator Bill English said the sky was overcast, with about 10 miles of visibility under the cloud cover, which began at about 500 feet above the ground.
Air guard, army guard, Charleston Police and Fire along with Yeager crews responded to the crash.
Initial reports said four people were believed to be on the plane at the time of the incident.
"My opinion is that something happened to that plane in air before it ever descended, before the crash", Galyon said.
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Commentary: Is a buyout worth taking? It was found Friday morning near the runway.
United Airlines said it canceled all flights into and out of the airport Friday. Most of the flights use smaller regional planes. The agency planned to hold a news conference Friday night in Charleston.
The crash occurred around 6:55 a.m.at Yeager Airport, the FAA's Salac said.
Kanawha County Commission President Kent Carper declared a state of emergency following the accident and had asked drivers to avoid any roads in the area.
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Two people died Friday morning after the plane crashed into the hillside in Charleston, a county spokesperson confirms to WSAZ.
Plante said there was no indication of any issues with the aircraft before the crash.
The National Transportation Safety Board is investigating.
Plante said that workers were working from the top and the bottom of the hill to reach the crash using chainsaw to hack their way through the brush.
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Plante reported that officials had no knowledge as to why the plane, which regularly flew between airports, had crashed this particularly clear, sunny day.