President of Russia Vladimir Putin: As you know, there has been an explosion on the St Petersburg metro. People have been killed and injured. I would like to express condolences and sympathy to the families of those killed and injured.
I have spoken with representatives of our security agencies and the FSB Director. Our law enforcement and security agencies are working to establish the causes of the explosion and to provide their assessment of the situation. The city authorities, and if needed, the federal authorities, will take the necessary measures to help the families of those affected by the blast.
The reasons behind it are not clear yet, and so it would be premature to speak about them. The investigation is ongoing. Of course, we always consider all scenarios, including accidental or criminal action, and above all, those of a terrorist nature. The ongoing investigation will soon provide answers regarding the causes of this tragedy.