A jet carrying 88 people crashed early Sunday morning in western Russia, killing everyone on board, an airline spokesman said, according to CNN.

Several foreigners were on the flight, including passport-holders from Abkhazia, Germany, France and Ukraine, said Lev Koshlyakov, spokesman for flight operator Aeroflot Nord.

Authorities are trying to confirm the presence of an American on board, Koshlyakov said.

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The Boeing 737 was en route to Perm from Moscow when the pilots lost communication with air traffic control just before landing about 3:10 a.m. (2110 GMT), Koshlyakov said. He described the weather at the time as "mediocre."

Eighty-two passengers -- including seven children -- were on board, in addition to six crew members.

The cause of the crash was not immediately known and is under investigation, Koshlyakov said. Rescue teams were on the scene.