Moscow -- A group of unidentified attackers has stabbed to death a Ghanaian in Russia's second largest city of St. Petersburg(ex Leningrad), RIA Novosti reported.

The 25-year-old man was taken to hospital in critical condition, with some 20 injuries to his head, neck, chest, kidney, stomach and limbs. He died several hours later.

A probe into the attack has been launched.

Russia has seen a wave of racially motivated crime since the collapse of the Soviet Union in 1991. Attacks by gangs of youths on foreigners and people with non-Slavic features are a routine occurrence in Moscow, St. Petersburg and Voronezh, which hosts many foreign university students.