Emergency services personnel and vehicles are seen at the entrance to Technological Institute metro station in Saint Petersburg on April 3, 2017. 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. / AFP PHOTO / Olga MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images)
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