（Source: CGTN）

In the wake of the blast, Russian President Vladimir Putin has arrived in Saint Petersburg and has made his way to the scene of the incident.

Putin paid tribute to the victims by laying flowers at the entrance of the subway station where the explosion took place, and expressed his condolences to the families of those killed and injured. Meanwhile in the nation's capital of Moscow, residents are lighting candles and laying flowers outside the Kremlin.

People have also placed red carnations next to a marble stone monument, which honors the brave who defended the then-called Leningrad during the second World War.