The Russian plane believed to be carrying six people was on a hospital flight from India to Uzbekistan and Russia

crashed in mountainous northeastern Afghanistan, the air transport agency Rosaviatsia announced Sunday.

The Falcon 10 "disappeared from the radar" and communication was lost on Saturday evening, the federal agency said.

The two-engined business jet built by France's Dassault in 1978 and owned by a company called Athletic Group

two passengers were Russians, one who was seriously ill, and the other her husband who had paid for the flight.

The plane has crashed but the location is not known yet. We have sent teams but they have not arrived yet," said Zabihullah Amiri

The area of the crash is eight hours by road from the provincial capital Faizabad, said Amiri.

Hindu Kush mountain range cuts through the province, which is home to Afghanistan's highest peak, Mount Noshaq at 7,492 metres (24,580 feet) tall.