An Interior Ministry spokesman said a civilian was killed and four senior police officers wounded by an unidentified gunman in a volatile province in southern Russia. Mark Tolchinsky of the ministry's branch in the province of Dagestan said the attacker entered a cafe where the officers were having a dinner and fired at them at point blank range Thursday. Tolchinsky said Friday the four officers were hospitalized with heavy wounds after the attack in the town of Khasavyurt. He said a civilian man who was at a neighboring table was killed. Chechnya and neighboring North Caucasus provinces have remained mired in violence stemming from wars between separatist Chechen rebels and the Russian government. Chechen rebels claimed responsibility Wednesday for last week's Russian train bombing, which killed at least 26 people and injured scores of others, a Web site sympathetic to the militants said. Three suspected militants were shot dead and six police officers were wounded in three separate clashes officials said Tuesday. November violence left a police officer, bystander and one militant dead. Islamic militants launch regular attacks on police and other authorities.