The Flightradar24 website showed the plane deviating from its normal route, crossing the Caspian Sea and then circling over the area where it eventually crashed near Aktau, an oil and gas hub on the eastern shore of the sea.
Azerbaijan state news agency AZERTAC reported the aircraft’s black box, which records the flight data, has been recovered.
The Kazakh transport ministry said the plane was carrying 37 nationals from Azerbaijan, six from Kazakhstan, three from Kyrgyzstan and 16 from Russia.
Azerbaijan Airlines, the country’s flag carrier, said the plane “made an emergency landing” around 3km from Aktau.
The Kazakh emergency situations ministry said its staff put out a fire which broke out when the plane crashed. About 150 emergency workers were at the scene.
Kazakhstan said it had opened an investigation into the cause of the crash, which was not immediately clear.
Azerbaijan Airlines initially said the plane flew through a flock of birds before withdrawing the statement.
“We cannot disclose any investigation results at this time,” the office of Azerbaijan’s prosecutor general said in a statement.
“All possible scenarios are being examined, and the necessary expert analyses are underway,” it added.
It said an investigative team led by the deputy prosecutor general of Azerbaijan has been dispatched to Kazakhstan and is working at the crash site.
