Police have detained six suspects in last month’s bomb attack in a fast food McDonald’s restaurant in Russian city of St. Petersburg, RIA Novosti reported 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, the suspects are members of an extremist group,” a police 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.
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