Policeman patrols at Pushkinskaya subway station in St.Petersburg, Russia, Friday, April 7, 2017. A bomb blast tore through a subway train under Russia's second-largest city on Monday, killing many people and wounding many others. Eight members of extremist cells have been arrested in connection with last week's deadly bombing on the subway in St. Petersburg, Russia's intelligence chief said Tuesday. (Photo by Dmitri Lovetsky/AP Photo)
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