Nigeria
Police are on high alert in Maiduguri in the state of Borno after suspected Boko Haram members sent text messages threatening an attack. Authorities are watching the movement of suspicious people in the Nigerian states bordering Chad, Niger, and Cameroon.

Doku Umarov claimed the attack was revenge for a February raid in the village of Arshty in Ingushetia. Umarov reiterated that attacks inside Russia would continue.