New details are emerging after a private plane crashed at an airport in Maine during Winter Storm Fern.

The Bombardier Challenger 600 crashed during takeoff from Bangor International Airport (BIA) around 7:45 p.m. local time on Sunday, Jan. 25, the Federal Aviation Administration said in a statement on X.

According to the FAA, six people died in the incident. Four of the deceased were passengers, while the other two on board were flight crew. There were no survivors. (The agency initially said that seven had died, with one survivor, who was seriously injured.)

The plane was departing from the airport when the crash occurred, the National Transportation Safety Board (NTSB) said in a news release shared on BGR’s website on Monday, Jan. 26.

The plane was upside down when it came to a stop, and subsequently caught fire, the FAA said. The exact circumstances surrounding the crash remain unclear.

In an audio recording of air traffic controllers’ conversation following the crash, one person said, “Aircraft upside down. We have a passenger aircraft upside down.”

First responders arrived at the scene less than a minute after the conversation about the upside-down aircraft, airport director Jose Saavedra said, the Associated Press reported.

But according to the Bangor Daily News, federal investigators have not been able to reach the site of the crash due to heavy snow and poor conditions from the storm.

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“A team of NTSB investigators is currently assembling and is expected to arrive on scene shortly,” NTSB said in its news release. “Once on site, the investigator will begin the process of documenting the scene and examining the aircraft.”

Afterward, the aircraft will be transported “to a secure facility for further evaluation,” the NTSB said.

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The plane involved in the crash had arrived from Texas and is registered to a company with a Houston address shared with the personal injury law firm Arnold & Itkin, Reuters reported.

The FAA did not immediately respond to PEOPLE’s latest request for comment. The NTSB directed PEOPLE to its aforementioned statement.