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Five people have been killed and three wounded during violence in Russia's North Caucasus region.

Interfax news agency reported that Russian soldiers shot dead four suspected rebel fighters in a mountainous area of the Kabardino-Balkaria Republic, some 1,400 kilometers south of the capital, Moscow.

In a separate incident, insurgents killed a senior police investigator in a road ambush in the Caspian Sea port of Kaspiisk.

A military spokeswoman said that in the neighboring Republic of Ingushetia, three Russian Army engineers were injured by a remote-controlled bomb.

Russian troops control major cities and towns in the Caucasus, but have been unable to put down armed resistance in the territory's rugged mountains and forests.

compiled from agency reports