3 die in Russian rescue helicopter crash

The Russian Emergencies Ministry says three people have died when one of its helicopters crashed near Moscow.
The Mi-8 helicopter went down during a training mission yesterday, killing Roman Frolov, the chief of the Zhukovsky aviation rescue center, and two other men. It crashed into a forest about 10 kilometers southeast of the capital.
The cause of the crash wasn't immediately clear, but some Russian reports mentioned engine failure as a possible cause.
The Emergencies Ministry today praised Frolov as a seasoned professional who has proven his skills in putting down forest fires and other missions.
The twin-engine Mi-8 has been a mainstay of Soviet and then Russian aviation since it entered service in the late 1960s and also has been widely used worldwide.