US intelligence says there is no reason to doubt that ISIS is responsible for the attack in Moscow. The Khorasan Province has carried out attacks in Afghanistan, Pakistan and Uzbekistan.
At least 45 people were killed in the attack on the concert hall in Krasnogorsk, Russia. The attack is the latest in a string of terror attacks in Russia in recent years, including the St. Petersburg bombings in 2013. The U.S. government has warned Americans to stay away from large gatherings in Russia, including concerts.