Major Incidents | Slideshow | Terrorism & Active Shooter

Explosion Rocks Russian Subway

01 / 08

Russia Subway Explosion

People carry a subway blast victim into an ambulance after explosion at Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that there are fatalities and several people have been injured in an explosion on a subway train. (Alexander Tarasenkov/Interpress via AP)

02 / 08

Russia Subway Explosion

Blast victims lie near a subway train hit by a explosion at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train. (AP Photo/www.vk.com/spb_today via AP)

03 / 08

APTOPIX Russia Subway Explosion

Blast victims lie near a subway train hit by a explosion at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train. (AP Photo/DTP&ChP St. Peterburg via AP)

04 / 08

Russia Subway Explosion

Paramedics carrie a subway blast victim into an ambulance after explosion at Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that there are fatalities and several people have been injured in an explosion on a subway train. (Alexander Tarasenkov/Interpress via AP)

05 / 08

Russia Subway Explosion

People carrie a subway blast victim into an ambulance after explosion at Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that there are fatalities and several people have been injured in an explosion on a subway train. (Alexander Tarasenkov/Interpress via AP)

06 / 08

Russia Subway Explosion

In this image taken from video footage, emergency services work outside Sennaya Square metro station in St Petersburg, Russia, Monday, April 3, 2017. At least 10 people were killed Monday in an explosion on the subway in St. Petersburg, Russian news agencies reported. (AP Photo)

07 / 08

Russia Subway Explosion

Russian emergency service patrol an area near to the Tekhnologicheskaya metro station after an explosion in St.Petersburg subway in St.Petersburg, Russia, Monday, April 3, 2017, with fatalities and many injured in the subway train blast. A spokesman for Russia's top anti-terror agency says law enforcement agents have found and defused another explosive device on St. Petersburg's subway. (AP Photo/Yevgeny Kurskov)

08 / 08

Russia Subway Explosion

Russian police and emergency personnel block an area at the Tekhnologicheskaya metro station after explosion in St.Petersburg subway in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reported an explosion on a subway train. (AP Photo/Yevgeny Kurskov)