Mass shooting at Moscow concert hall, 143 dead, ISIS claims
Four suspects detained after a mass shooting at a Moscow concert hall, two captured after a car chase in Bryansk region. Russian President informed of 11 detentions, including 4 attackers. Death toll reported at 143. ISIS claims responsibility for the attack, the deadliest in Russia since the 2004 Beslan school siege. Security measures are in place to assist those affected.