According to local media reports, up to six more victims are being examined on location in the Russian city.
Four people have been taken to hospital following an explosion in a storage locker at a busy St. Petersburg supermarket.
After at least 10 people were injured when an explosive device detonated in St Petersburg, Russian President Vladimir Putin said that the blast was a terrorist act.
Putin's spokesman, Dmitry Peskov, would not offer any specifics on what led Putin to declare the attack an act of terrorism. Alexander Klaus, head of the Investigative Committee of Russian Federation in St. Petersburg, confirmed the individuals had sustained non-life-threatening injuries and were admitted to hospitals.
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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 evacuation has been completed, and there was no fire", a Emergencies Ministry official told the Russian news agency TASS.
No group has claimed responsibility for the explosion at the market in the Kalininsky district, on the ground floor of the Gigant Hall leisure centre, although Islamic terrorists have been to blame for several attacks and plots in the city in recent years.
10 people sustained injuries during the explosion, but there were no fatalities.
The bomb was strong enough to blow the door off the supermarket and punch a hole in the wall.