Four people directly involved in the Moscow concert hall attack are among 11 detained, Russia's security chief tells President Putin.
At least 115 people were killed when gunmen attacked a packed concert venue on the outskirts of Moscow, Russia says.
More than 140 others were wounded at the Crocus City Hall, according to the FSB Federal Security Service.
The US says it's credible that the Islamic State group could be behind the attack, after it said the group did it. Russia has not commented.
A large fire engulfed the roof of the complex and dramatic video shows panicked concertgoers taking cover as shots and explosions ring out.
The White House says it is working to find out more about the situation and Ukraine has denied any involvement in the attack.
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