Four people, including a policeman, were killed on Wednesday when a car bomb exploded in Russia's Dagestan republic, the interior ministry said.
The car blew up in Khajalmakhi village. Four other police officers were injured. The bomb went off when policemen tried to check a suspicious car.
Russia has been plagued by terror attacks for years, many of which originate from the North Caucasus republics of Chechnya, Dagestan and Ingushetia.