Moscow concert hall attack leaves 115 dead, suspects detained

Russian authorities detained 11 people after gunmen attacked a Moscow concert hall, leaving at least 115 dead. The Islamic State claimed responsibility, but Russian agencies linked the attack to Ukraine. Four suspects were apprehended near the Ukrainian border. The attack occurred days after Putin's re-election. The U.N. Security Council condemned the attack, and Putin denounced Western warnings of terrorism. In response, hundreds in Moscow donated blood.