Moscow - June 24-26 have been declared days of mourning in Dagestan, Melikov said, with flags lowered to half-staff and all entertainment events canceled.
The restive region was in the 2000s hit by an Islamist insurgency spilling over from neighboring Chechnya, with Russian security forces moving aggressively to combat extremists in the region.
In recent years, attacks had become rarer, with Russia's Federa
