MOSCOW, Oct 21 (Reuters) - A helicopter crashed on Sunday in the Kemerovo region of Siberia killing four people, Itar-Tass news agency reported, citing rescue workers.

The U.S. made MD-600 helicopter was flying in poor weather and without permission from flight control, Tass said. No other details were immediately available.

Helicopters are used frequently in Siberia to cover tough terrain.

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