As of now, it has been established that 10 people were taken to the city's hospitals with injuries.
At least 10 people have been injured by an explosion at a supermarket in St Petersburg, Russia's second-largest city and the site of a deadly subway bombing earlier this year. A man of non-Slavic appearance, who was recorded on security cameras, left the bomb in a backpack inside a locker in a Perekrestok supermarket before fleeing the scene, the Fontanka news service reported. The committee has opened a criminal investigation into "an attempt to kill two or more persons in a generally unsafe way".
An investigator works inside the supermarket after an explosion, in St. Petersburg, Russia, Thursday, Dec. 28, 2017.
The blast comes after a suicide bombing killed 15 people and wounded dozens on the Saint Petersburg metro in April.
No one has claimed responsibility for the attack.
Putin said he told the chief of Russia's main domestic security agency, the FSB, that agents who encounter resistance from terror suspects should "liquidate bandits on the spot".
The explosion occurred at around 1845 local time as Russians geared up to celebrate the New Year - the country's biggest holiday - followed by Russian Orthodox Christmas, which falls on January 7.
"There was a bang".
The bomb was strong enough to blow the door off the supermarket and punch a hole in the wall.