A terror attack at a concert hall in Moscow left at least 133 people dead. The Islamic State claimed responsibility, but there are suggestions of a Ukrainian link. President Putin has declared a day of mourning and vowed additional security measures.
Key Points
ISIS claimed responsibility for the attack
President Putin declared it a terrorist act and a day of mourning
Security measures have been increased across the country
Possible Ukrainian link to the attack
Pros
Quick response from authorities in apprehending suspects
President Putin addressing the nation and declaring a day of mourning
Additional security measures put in place to prevent future attacks
Cons
High death toll of at least 133 people
Terrorist attack causing shock and horror in the nation