Several shots from grenade launchers damaged the building of a railway station in Russia's North Caucasus republic of Ingushetia, but left no casualties, a local police source said.

The attack occurred late on Tuesday in Ingushetia's largest city of Nazran.

"A group of unidentified attackers fired several shots from rifle-mounted grenade launchers at a railway station. At least one round exploded inside the building," the source said.

"Fortunately, the passenger terminal was closed for the night and no one was injured in the blast," the official added.

A similar attack killed one police officer and injured at least five other people in Nazran on Monday.

Russia's mainly Muslim North Caucasus republics, especially Chechnya, Dagestan and Ingushetia, have seen an upsurge of militant violence lately, with frequent attacks on police and officials.

Russian President Dmitry Medvedev recently ordered the Federal Security Service to tighten security in the volatile North Caucasus following a suicide bomb attack in Dagestan that killed five people and wounded up to 19 on January 6.

ROSTOV-ON-DON, February 3 (RIA Novosti)