A powerful explosion has hit Buinaksk. The bomb went off on Tsiolkovsky Street at around 21:00 Moscow time. Lethal casualties have been reported among servicemen and law enforcers. Some of them are wounded. A republican Interior Ministry source told Itar-Tass that the bomb had exploded at around 21:00 Moscow time in a building where the military and law enforcers were on duty. The number of the dead and wounded is being established. Bomb technicians and investigators are working at the blast scene.