A technical fault of two engines has become a preliminary cause of the Russian Falcon 10B jet crash in Afghanistan, a source in operative services told TASS.

"A technical fault of preliminarily two engines has become the cause of the crash," he said.

The Russian Federal Agency for Air Transport said earlier that late on Saturday, on January 20, flying in the airspace of Afghanistan (near Tajikistan’s border), the Falcon 10 aircraft that was registered in the state register of civil aircraft of the Russian Federation, stopped establishing communication and disappeared from radars. The aircraft initially took off from the Thai U-Tapao airport, performing a charter sanitary flight on route Gaya (India) - Tashkent (Uzbekistan) - Zhukovsky (Russia). Six people were aboard the aircraft, according to preliminary data, the agency said. Two Russians were aboard, a source in operative services told TASS.