Moscow - A man was injured by an explosion Tuesday near the Russian Black Sea resort of Sotchi, host city for the 2014 Winter Olympics, the state-run RIA Novosti agency reported.

The explosives were hidden in a beer can and the 28-year-old lost a hand when he found it on his car and attempted to throw it away.

The explosion brings the number of incidents in the area this year to six. Since April, four people have died as a result of attacks while two dozen have been injured.

The reasoning behind the attacks remains uncertain and according to media sources Russian police are investigating several possibilities, including terrorism, opponents of Sochi hosting the Games or criminality. (dpa)