Moscow concert attack: Relatives of missing desperately seek answers - BBC.com
- Moscow concert attack: Relatives of missing desperately seek answers BBC.com
- Why Russia's Vast Security Services Fell Short on Deadly Attack The New York Times
- Caught up in concert shooting, a Russian woman said goodbye to the world Reuters
- Analysis | Putin sees Kyiv in Moscow terrorist attack. But ISIS is its own story. The Washington Post
- Putin's Intel Problem Newsweek