The Takfiri group, ISIL group has claimed responsibility for a shooting at an ancient citadel in Russia’s volatile North Caucasus region of Dagestan that killed one and injured 11

The Takfiri group, ISIL (so-called Islamic State in Iraq and Levant) group has claimed responsibility for a shooting at an ancient citadel in Russia's volatile North Caucasus region of Dagestan that killed one and injured 11, the SITE Intelligence Group said.

"With the help of Allah, 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 extremist monitoring organization SITE quoted ISIL as saying on Wednesday.

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.

Extremist militants in Dagestan, a restive region just east of Chechnya, have been increasingly flocking to join ISIL, which in June declared it had established a franchise there.

Syria's Al-Qaeda affiliate Al-Nusra Front had called on Takfiris 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 on Wednesday.

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.

The gunmen, who were reportedly in the forest, opened fire at people standing by the fortress, which was declared a UNESCO World Heritage site in 2003.