YEKATERINBURG, RUSSIA - 4 APRIL 2017: Flowers in memory of the victims of the St. Petersburg Metro explosion at Chkalovskaya station of the Yekaterinburg Underground. An explosion hit a train carriage between Sennaya Ploschad and Technologichesky Institute stations of the St. Petersburg Underground on 3 April 2017, killing at least 11 and injuring 45 people.
YEKATERINBURG, RUSSIA - APRIL 4, 2017: Flowers in memory of the St Petersburg Metro explosion victims at Chkalovskaya station of the Yekaterinburg Underground. A blast hit a train carriage between Sennaya Ploschad and Tekhnologichesky Institut stations of the St Petersburg Underground on April 3, 2017, killing at least 11 and injuring 45 people. Donat Sorokin/TASS