Four people survived and two are still unaccounted for after a Russian plane crashed in mountainous northeastern Afghanistan, the air transport agency Rosaviatsia said Sunday.

The Falcon 10 business jet was believed to be carrying six people on a hospital flight from India to Uzbekistan and Russia before communication was lost on Saturday evening.

“Of the six people on board the aircraft, tentatively, four are alive. They have various injuries. The fate of two people is being clarified,” Rosaviatsia said, citing the Russian embassy in Afghanistan.

The state-run RIA Novosti news agency said two passengers were Russians, one who was seriously ill, and the other was her husband who had paid for the flight.