In pictures: Bombing at St. Petersburg subway

11 killed and dozens injured during a hometown visit by President Vladimir Putin
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Police and emergency services personnel carry an injured person on a stretcher outside Technological Institute metro station in Saint Petersburg. (ALEXANDER BULEKOV/AFP/Getty Images)
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Russian President Vladimir Putin places flowers in memory of victims of the blast in the Saint Petersburg metro outside Technological Institute station. (STR/AFP/Getty Images)
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Damaged train carriage at Technological Institute metro station in Saint Petersburg. Around 10 people were feared dead and dozens injured Monday after an explosion rocked the metro system in Russia's second city Saint Petersburg, according to authorities, who were not ruling out a terror attack. (STR/AFP/Getty Images)
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Emergency services personnel and vehicles are seen at the entrance to Technological Institute metro station in Saint Petersburg. (OLGA MALTSEVA/AFP/Getty Images)
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Police officers guard the area at the entrance to Technological Institute metro station in Saint Petersburg. A blast hit the metro system of Russia's second city Saint Petersburg Monday, authorities said, with news agencies quoting security sources as saying that about ten people have been killed. (RUSLAN SHAMUKOV/AFP/Getty Images)
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Medics help an injured woman outside Technological Institute metro station in Saint Petersburg. (ALEXANDER TARASENKOV/AFP/Getty Images)
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Around 10 people were feared dead and dozens injured Monday after an explosion rocked the metro system in Russia's second city Saint Petersburg, according to authorities, who were not ruling out a terror attack. (STR/AFP/Getty Images)
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Emergency services personnel and vehicles are seen at the entrance to Technological Institute metro station in Saint Petersburg. (OLGA MALTSEVA/AFP/Getty Images)
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Security personnel check passengers at the entrance to Leningradsky railway station in Moscow. Russia opened a probe into a suspected 'act of terror' Monday after 10 people were killed and dozens more injured in a blast that rocked the Saint Petersburg metro. (ALEXANDER NEMENOV/AFP/Getty Images)
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Police and emergency services personnel and vehicles are seen at the entrance to Technological Institute metro station in Saint Petersburg. (OLGA MALTSEVA/AFP/Getty Images)