They left flowers at the place where Samba Lampsar Sall was gunned down on April 7.
The 28-year-old Sall was killed as he emerged from a nightclub, where he and other students had been holding an annual faculty party.
Prosecutors quote witnesses as saying Sall's murderers used a shotgun decorated with a Nazi swastika symbol.
The Senegalese government demanded on April 8 that Sall's killers be "prosecuted and severely punished."
St. Petersburg has been the scene of several attacks and killings on foreigners. In most instances, the culprits were skinheads.
Epidemic Of Hate
Yusuf Sultonov, whose 9-year-old daughter was beaten and stabbed to death in St. Petersburg on February 9, 2004 (TASS)
EXTREMISM ASCENDANT: More than half of Russians have xenophobic views, according to a report published in August 2005. In the report, rights groups say that -- despite progress in some areas -- racism, xenophobia, and anti-Semitism remain rife in Russia. But what worries watchdogs most are recent moves by nationalist-patriotic movements to form paramilitary groups....(more)
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