A suspected "Black Widow" female suicide bomber attacked a bus in the southern Russia city of Volgograd today, not far from Sochi, the site of the February 2014 Winter Olympics. The attack is the first such incident in the region in over a year. According to Russia's Federal Investigative Committee, a 30-year-old Dagestani woman named Naida Asiyalova boarded the bus at a stop, then detonated shortly afterward in an explosion that killed at least six people and wounded 32 others. There are thought to have been about 40 people on the bus. Identity documents found near the blast site indicated...