MOSCOW, March 23 (Reuters) - At least two people were killed when a Russian helicopter crashed into mountains in northern Russia, a regional spokesman for the emergencies ministry said on Friday.

The helicopter with six people on board went missing on Wednesday.

"Two people perished, their bodies have been found," Anatoly Nuikin told Reuters, adding that rescuers were looking for the four others.

The Mi-8 helicopter, owned by a unit of gas giant Gazprom, did not return to base and made no radio contact, news agencies have reported.

At least 177 people have been killed in a trio of disasters in Russia in the past week.

Two Russian fighter jets collided on Wednesday but both pilots ejected and no-one was killed.

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