"The warriors of the Khalifate were able to attack a group of Russian special service officers in the city of Derbent in southern Dagestan, killing one officer and injuring the others," the jihadist monitoring organisation SITE quoted IS as saying yesterday.
The deadly attack took place on Tuesday night near the citadel of Derbent, which claims to be Russia's oldest city, and which this year celebrated its 2,000th anniversary.
Syria's Al-Qaeda affiliate Al-Nusra Front had called on jihadists from the Caucasus to perpetrate attacks in Russia in response to Moscow's bombing campaign in the country.
The shooting took place as Russian warplanes wrapped up two days of intensive bombing raids over Syria, carrying out 121 sorties in which they hit 424 targets, the military announced yesterday.
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The attack targeted Russian security forces, with an unnamed source telling RIA Novosti state news agency that a member of the Federal Security Service (FSB) had been killed and another injured in the shooting.
Sixty-seven bullet casings were recovered at the scene, a law enforcement source told Interfax news agency yesterday.
Located on the southeastern shore of the Caspian Sea, Derbent served as a strategic port city at the crossroads of empires and was incorporated into the Russian empire in the 19th century.
The Kremlin is currently fighting a deadly insurgency against Islamist rebels in the largely Muslim North Caucasus, with unrest particularly intense in Dagestan.
At least 118 people were killed there between January and November as a result of the conflict, according to the Caucasian Knot news portal, which monitors militancy in the North Caucasus.
According to FSB figures released earlier this month, nearly 2,900 Russians are fighting or have fought with the extremist jihadists in Iraq and Syria.