By IVAN NECHEPURENKO and NEIL MacFARQUHARAPRIL 3, 2017

ST. PETERSBURG, Russia — It was 2:40 p.m. on Monday, a lull before the evening rush hour in Russia’s second-largest city, St. Petersburg, where the subway normally carries two million people a day. The train had just entered a tunnel between stations, on its way out of a sprawling downtown hub, when the bomb exploded.


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