Some details of the atrocity emerged from Paris prosecutors:
The violent event in Paris dominated world headlines, but they were not the only deadly attacks the terror group has carried out this week.
One night before Lebanon was left reeling after the worst terror attack in Beirut in years left at least 43 people dead and 250 injured in a double suicide bombing.
Early on Friday, an Isis militant blew himself up at the funeral of a pro-government Shia fighter in Baghdad, killing at least 18 people and wounding 41.
The Global Terrorism Index (GTI) shows over 80 per cent of global deaths from terror attacks occurred in just five countries. The figures paint a shocking picture. Europe had managed to keep itself safe in comparison to places like Irag and Lebanon until the event in Paris.
What kind of world will our children inherit?