Dagestan
Russia says it intercepted Islamic State attack plot
On 17 December, police killed two attackers targeting security forces in Russia's neighbouring republic of Chechnya.
A search for the attacker is now underway. Local police declined to comment.
Two seperate terrorist attacks in Volgograd have left at least 33 people dead and over 100 injured.
Dagestan has drawn international attention due to its connection to the Boston bombings.
More violence has erupted in Russia's Northern Caucas region between Islamists and Russian forces.