At least 133 people were killed and 152 others were wounded when camouflaged gunmen stormed a concert hall in a Moscow suburb and set fire to the building on Friday night.
The Islamic State jihadist group has claimed responsibility for the mass killing, which Russian President Vladimir Putin called a "barbaric terrorist attack" and said would not go left unpunished.
But questions remain as to how the gunmen were able to carry out their attack with seeming ease despite prior warnings from Western governments that such an incident was "imminent."
We asked people in Moscow the day following the attack who they believed stood to gain from the mass killing and whether they thought the government's response was enough.
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