Five policemen were injured in an attack of gunmen on driving armoured UAZ vehicles in the Kizilyurt district of Dagestan on Tuesday, dpa reported. "The attack was delivered in the outskirts of Khontaul overnight to Tuesday," a source in the republican law enforcement agencies told Itar-Tass on Tuesday. Unidentified gunmen detonated an explosive device on the roadside, when two armoured UAZ vehicles were driving on the road. After that they opened automatic fire at the law enforcers, the source said. The investigation into the clash and the search for the attackers both continue.