St. Petersburg
Russian authorities arrested Darya Tryopova, a 26-year-old St. Petersburg resident suspected of involvement in the attack.
Russian news reports said blogger Vladlen Tatarsky was killed in the explosion at the Street Food Bar No. 1 cafe in St. Petersburg.
Oleg Sokolov reportedly confessed to the murder of former student Anastasia Yeshenko after her body was found in his St Petersburg apartment.
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WHAT'S HAPPENING
St. Isaac's Cathedral is one of the world's biggest -- and the church wants it back.
