Scenes from the aftermath of an explosion that hit the subway system in St. Petersburg, Russia, on April 3.
St. Petersburg Metro Explosion
Emergency-services personnel tend to an injured person outside the Sennaya Ploshchad subway station.
An injured person seen outside the Sennaya Ploshchad subway station.
Emergency vehicles and a helicopter are seen outside the St. Petersburg Metro's Tekhnologichesky Institut station.
An injured person is treated outside the Sennaya Ploshchad subway station.
Police officers block an entrance to the Tekhnologichesky Institut subway station.
An injured person is helped by emergency services outside the Sennaya Ploshchad subway station.
Emergency vehicles and a helicopter seen outside the entrance to St. Petersburg's Tekhnologichesky Institut subway station.
An injured person stands outside the Sennaya Ploshchad subway station.