Moscow: The Russian Transport Ministry today said 18 people were killed when a helicopter crashed on its way to an oil station in northern Siberia in the early hours of the morning.

The ministry said the Mi-8 helicopter carrying three crew members and 15 passengers crashed when it collided with machinery carried by another helicopter soon after takeoff.

It added that the second helicopter landed safely and that the accident took place in "normal" weather conditions.

There was a second helicopter that landed safely and that the accident took place in "normal" weather conditions.

"The first take-off was carried out by a Mi-8 with an external cargo suspension without passengers on board, the second take-off was performed with passengers who were workers on shifts at the oil station," the ministry said in a statement.

"According to preliminary information, the Mi-8 carrying passengers for reasons unknown collided with the external suspension of the second helicopter after take-off. As a result it fell, was destroyed and burned," it added.

The dead comprise three crew members and 15 passengers.

Russian national airline Utair is the operator of these helicopters.Utair's head office is in Khanty Mansiysk airport in western Siberia. It said the crash took place at 5.43 AM Moscow time (8:13 AM IST) after taking off from a helipad at the Vankor oil and gas field, in the Turuhansk district of the Krasnoyarsk region.