According to preliminary information released by Russia’s TASS news agency, rescue teams are being dispatched to the site of the blast with a witness telling Reuters that eight ambulances were seen near the Sennaya Ploshchad metro station.
Another Russian news agency, RIA Novosti, however, reported that there have been apparently two separate explosions at two metro stations.
Three metro stations have been closed, according to Fontanka local media outlet.
“An evacuation from the stations is ongoing, there are people injured,” the St. Petersburg metro said in a statement carried by Russian news agencies, adding, “An unidentified object supposedly blew up in a (train) carriage.”
Another report by St Petersburg emergency services said indicated that there were blasts in two train carriages at two metro stations.
Russia’s Interfax news agency cited a source as saying that at least one of the blasts involved a device filled with shrapnel, adding that at least 20 people had been injured.