Officials said 13 people were injured Wednesday when an improvised explosive device went off at a storage area for customers' bags at the supermarket in St. Petersburg.
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A total of 10 people were injured, the Russian state-run news agency Sputnik said.
Alexander Klaus, the head of St Petersburg's investigative committee, said according to the Associated Press (AP): "All possible versions of what has happened are being worked on. At the moment, the lives of those injured are not under threat".
Russian authorities consider the bombing an act of attempted murder but have not yet classified it as terrorism.More news: Meghan Markle becomes first fiancée to join royal family for Christmas
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The incident took place in the Perekrestok supermarket, which is located on the ground floor of the Gigant Hall leisure centre in the city's northwest Kalininsky district.
A policeman stands guard near a supermarket after an explosion in St Petersburg, Russia December 27, 2017.
Preliminary data shows that an explosive device found at the scene contained 200 grams (7 ounces) of TNT, state-run RIA news agency reported.
The bomb was strong enough to blow the door off the supermarket and punch a hole in the wall.