The Islamic State 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. The deadly attack took place on Tuesday night near the citadel of Derbent, which claims to be Russia’s oldest city.

Islamist rebels in Dagestan, a restive region just east of Chechnya, have been increasingly flocking to join IS, which in June declared it had established a franchise there. Syria’s Al-Qaeda affiliate Al-Nusra Front had called on militants from the Caucasus to perpetrate attacks in Russia in response to Moscow’s bombing campaign in the country.