"According to preliminary information, the Mi-8 carrying passengers, for reasons unknown, collided with the external suspension of the second helicopter after take-off".
There were 15 passengers and three crew aboard the crashed helicopter, said a statement from the operator, UTair airlines.
There were 15 passengers and three crew aboard.
The second helicopter was able to land safely.
The dead were working for a subsidiary of oil giant Rosneft in the remote Vankor oil field, which is above the Arctic Circle.
UTair, one of Russia's largest airlines, operates an extensive fleet of helicopters serving Siberian oil fields as well as fixed-wing flights within Russian Federation and to global destinations, mostly in the former Soviet republics.
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In a statement issued on its website, Utair said the crash took place at 05:43 Moscow time (0243 GMT) after taking off from a helipad at the Vankor oil and gas field, in the Turuhansk district of the Krasnoyarsk region.
'The helicopter had undergone a pre-flight inspection, it was technically sound, ' said a law enforcement source.
Eighteen people have been killed in a horrific helicopter crash after its blades hit cargo hanging off another helicopter.
In April, a Mi-8 helicopter crashed in far eastern Russian Federation, killing six people.
Both black boxes of the helicopter were found, a source in regional emergency services was quoted by Sputnik news agency as saying, adding that the recorders were in a satisfactory condition.
Utair has launched its own investigation of the Siberian crash and offered its condolences to families of the deceased.