Injured at the Saint Petersburg explosion

In an explosion in a warehouse of a supermarket in the Russian St.

Four people have been brought to hospital with an injury, reports RT. Six others are treated on the spot. Fifty people would have been evacuated.

The supermarket is located in a large shopping center where thousands of people would have been shopping. A government spokesman confirmed to news agency TASS that a 'bang' had been heard. There was no fire. What is the cause of the explosion is unknown.