The Islamic State of Iraq and Syria (ISIS) has claimed responsibility for one of the most deadly terrorist attacks in Russia in years
The death toll in Friday’s terror attack on a concert in Moscow has soared to at least 133, Russia’s top state investigative agency said Saturday, with authorities saying they have apprehended 11 suspects, four of whom were directly involved in the onslaught.
President Putin addressed the shocked nation in a televised broadcast on Saturday, slamming the massacre as "a bloody, barbaric terrorist act." He declared Sun., March 24, a day of mourning.
Putin said that additional security measures have been put in place throughout the country following the attack – the deadliest in over 20 years.

Death toll rises to 133 in Moscow terror attack, 11 suspects arrested
Eleven people have been arrested in relation to Friday’s terror attack in Moscow, Russia, that left more than 100 people dead.