Russian officials say 15 people are injured after a passenger helicopter made a rough emergency landing in Siberia this morning. The Mi-8 helicopter with 21 passengers and three crew members got caught in a snowstorm soon after taking off.<br />'' <br />'' Officials from the local branch of Russia's Emergency Ministry said, the helicopter toppled over upon landing. Police are investigating the accident.<br />'' <br />'' The Mi-8, code-named Hip by NATO, is a medium twin-turbine helicopter designed in the Soviet Union and widely used in Russia as a transport aircraft. <br />''