Unknown assailants launched grenades at a freight train in Russia's volatile North Caucasus republic of Ingushetia, a police source said on Monday.

No one was hurt in the attack, which took place at the central station in Nazran, the republic's largest city, on Sunday evening.

"A carriage was damaged, and the windows of two houses next to the station blew out," the source said.

Police discovered part of the grenade launcher at the scene. The investigation will continue on Monday.

Ingushetia, part of Russia's troubled trinity of North Caucasus republics that also includes Chechnya and Dagestan, sees almost daily militant activity.

The republic also suffers high levels of crime, with Russia's general prosecutor saying on Thursday that crime was "out of control" in Ingushetia.

MOSCOW, March 1 (RIA Novosti)