The pattern has become all too familiar. Young people gathered for a musical event find themselves subjected to what British Prime Minister Theresa May has described as an “appalling terrorist attack”.
While there is no confirmation as yet this was a terrorist-inspired incident, police suspect the Manchester attack, which has so far killed 19 people and injured 59 others, was caused either by a bomb contained in an abandoned backpack, or was the work of a suicide bomber.
At this stage no group has claimed responsibility. But it is not being overlooked that last week Islamic State released a 44-minute video in

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