Russian law enforcement agencies say five suspected militants, including an alleged mastermind of last month's bombing of a bus in Volgograd, have been killed in a special security operation outside Makhachkala, Daghestan.
Russian news agencies reported that police on November 16 surrounded a house in the village of Semender where Dmitry Sokolov and the other alleged gunmen were hiding.
Muslim-convert Sokolov was reportedly married to suspected suicide bomber Naida Asiyalova, who is linked to October's suicide attack on a passenger bus in the southern city of Volgograd.
At least six people were killed in that attack.
Earlier on November 16, Russian officials said Sokolov had claimed responsibility for plotting several terrorist attacks, including the attack on the Volgograd bus.
Sokolov has allegedly said he "prepared the explosive device, which the suicide bomber later detonated" inside the bus.
Based on reporting by Interfax, ITAR-TASS, and Rian.ru