Putin later declared the explosion to be terrorism. 13 wounded is the final tally from the attack.
A huge explosion has rocked a busy supermarket in St Petersburg, leaving at least 10 people injured.
The blast happened in the Perekrestok supermarket in the northwest of the city, and shoppers fled in panic as emergency crews descended on the scene.
It is thought a bomb packed with shrapnel exploded in a storage locker, and authorities are treating the explosion as a deliberate attempt to kill.
From CIW NEWS Contributor
St. Petersburg, Northwestern, Russia
Russia (RU) is estimated to have a population of 146.7 million with a growth rate during 2010-2015 of 0.0% pa.
At the same rate of change, in five years' time its population will increase by 0 million.