ST. PETERSBURG, March 22 (RIA Novosti) - Police have detained six suspects in last month's bomb attack in a fast food restaurant in Russia's second city, a police source said Thursday.
The bomb, equivalent to 75 grams of TNT and packed with shrapnel, exploded in a McDonald's restaurant in downtown St. Petersburg February 18 injuring six people, including a German national.
"According to preliminary information, they [the suspects] are members of an extremist group," the source said.
Investigators are checking whether the suspects may have been involved in a series of attacks on foreigners and an explosion in a flower kiosk that left the attendant injured in early February.
The suspects were identified with the assistance of surveillance cameras installed in McDonald's.
