MOSCOW : Russian law enforcement officers on Sunday raided a hideout in the North Caucasus of armed militants allied with the Islamic State group, killing all 11 of them in an exchange of fire, the counter-terrorism agency said. The reinforced base in a wooded, mountainous area on the outskirts of Nalchik, the capital of the Kabardino-Balkaria republic, contained a workshop for producing explosive devices and a stockpile of weapons and ammunition, the National Anti-Terrorist Committee said in a statement. It said all 11 militants were killed after opening fire on the officers and using grenades, while there were no fatalities among the officers.