By The New York Times U.S. officials said the Islamic State was responsible for the attack, one of the deadliest in Russia in decades.
Source: Live Updates: Gunmen Kill at Least 40 at Moscow Concert Hall, Russian Officials Say
By The New York Times U.S. officials said the Islamic State was responsible for the attack, one of the deadliest in Russia in decades.
Source: Live Updates: Gunmen Kill at Least 40 at Moscow Concert Hall, Russian Officials Say