Gunmen have attacked churches, a synagogue, and a police post in Russia’s North Caucasus region of Dagestan, killing at least 15 police and National Guard officers, several civilians, and an Orthodox priest, according to authorities.

Iran PressEurope: At least 12 people were injured in the attacks, which took place in the cities of Derbent and Makhachkala on Sunday, the festival of Pentecost for the Russian Orthodox Church.

Russia’s Investigative Committee said it had opened criminal investigations over “acts of terror” in Dagestan, which neighbors Chechnya and is one of the poorest areas of Russia.

The Russian news agency TASS, citing law enforcement agencies, reported that the gunmen were members of “an international terrorist organisation”.

The attackers have not yet been identified.

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