People lay flowers to commemorate victims of an explosion in St. Petersburg in Moscow, Russia, on April 6, 2017. About fifty thousand people gathered here at Manezhnaya square on Thursday to commemorate victims of the explosion in St. Petersburg. A blast took place on Monday afternoon in a train carriage in the tunnel between metro stations Technological Institute and Sennaya Ploshchad in St. Petersburg, Russia's second largest city, killing 14 people and wounding dozens. (Xinhua/Evgeny Sinitsyn)
