Russian investigators receive more than 100 missing person reports after Moscow concert hall attack CNNAnalysis | Putin sees Kyiv in Moscow terrorist attack. But ISIS is its own story. The Washington PostRussia says it is hard to believe Islamic State could have launched Moscow attack ReutersRussia Doubles Down on Blaming Concert Massacre on Ukraine and the West The Wall Street JournalVladimir Putin blames ISIS and Ukraine for Moscow concert attack USA TODAY