Police, bomb-disposal experts and rescuers have arrived at the scene, APA reports quoting sputniknews.
An emergency services' source told Sputnik that 10 people have been injured as a result of "an explosion of an unidentified device" in a shop in the Russian city of St. Petersburg, which has prompted the evacuation of at least 50 people.
According to the Russian Investigative Committee, preliminary data shows that a device stuffed with damage agents is likely to be the cause for the explosion.