A Russian airline helicopter has crashed shortly take-off killing 18 people.
Fifteen passengers and three crew members aboard the helicopter were killed, a source at the emergency services told the state-owned TASS news agency.
Russian airline Utair has sent specialists to the scene, which is in an oil field managed by the energy company Rosneft some 1,600 miles northeast of Moscow.
The second helicopter involved landed safely.
The Interstate Aviation Committee, which oversees civil aviation in much of the former Soviet Union, said the Mi-8 helicopter collided with the load being carried by another helicopter.
The helicopter was reportedly taking workers to an oil station.
"He flew 5,990 hours, 2,300 of which he was the helicopter commander", Utair's statement said.More news: What to expect from Juventus and Milan in 2018-19?
Investigators are looking into all possible reasons for the crash including pilot error, the Russian daily newspaper said.
According to preliminary data, the helicopter collided with the external cargo suspension of another helicopter that took off earlier, before it fell, collapsed and burnt, a statement published by Russia's Federal Air Transport Agency said.
A Mi-8 helicopter with passengers on board has crashed in Krasnoyarsk Region, Siberia.
'Utair's Mi-8 helicopter 25640 was flying from Vankor to Kharkasale, ' said an spokesman for Russia's emergencies ministry.
The Mi-8 crashed to the ground seconds after takeoff and exploded in an inferno in the Krasnoyarsk region of Russian Federation.
In November 2017, six people died when a small plane crash-landed in the Khabarovsk region.