A file picture taken on September 19, 2015 shows people walking in front of the Naryn-Kala Fortress in Derbent.

The Islamic State of Iraq and Syria (ISIS) 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 monitoring organization SITE quoted ISIS as saying several hours after Wednesday’s deadly attack.

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