Russian President Vladimir Putin on Monday offered his condolences to the families of those who lost their lives in the explosion at the St Petersburg metro station in Russia, saying the government will probe all possible angles including terrorism.
In a statement issued, Russian news agencies quoted Kremlin spokesman Dmitry Peskov as saying that President Putin was informed of the explosion and that he will visit the city Monday.
A blast ripped through the metro station on Monday afternoon leaving at least ten people dead and over 50 injured. While authorities are yet to issue an official statement, unconfirmed reports have said that there are children among the casualties.
All metro stations in St Petersburg are closed and Moscow metro is taking extra security precautions.
Prime Minister Narendra Modi on Monday expressed his heartfelt condolences on the loss of lives in the blast in a metro train in the Russia's St. Petersburg. "Deeply saddened by the loss of lives in the blasts at St. Petersburg metro. Heartfelt condolences to the families of the victims," Modi said in a tweet. The explosions occurred as the train was travelling between the Tekhnologichesky Institut and Sennaya Ploshchad stations of the St. Petersburg Metro, the National Anti-Terrorism Committee said.
The St. Petersburg subway immediately shut down all of its stations and the national anti-terrorism body said security measures would be tightened all key transport facilities across Russia.
A three-day period of mourning has been declared in St Petersburg. The blast came as President Vladimir Putin was visiting the city, his hometown. Interfax cited a source saying the blast was caused by a bomb filled with shrapnel.
German Foreign Minister Sigmar Gabriel said he learned of the explosion "with deep sorrow." He added that Germany's thoughts were "with our friends in Russia, the victims and their families in this dark hour.