Police in Dagestan say that they have killed the suspected mastermind behind the Volgograd bombings. The militant, who was identified as leader of the "Kadarskaya" gang, is known only as Mirzayev, a Dagestani law-enforcement source said. The source said that he might have sent two suicide bombers to Volgograd late in December 2013.The special operation was carried out in the town of Izberbash. The source said, "The house was blocked on Wednesday morning. During the talks, one of the militants' accomplices surrendered. The rest, including Mirzayev, opened fire and were killed in a shootout."