Yesterday’s terror attack in Westminster fits an increasingly familiar pattern.
An attacker, using a car to mow down pedestrians and a knife to assault police, went on a deadly rampage at the heart of one of Europe’s great cities, seizing headlines and putting terrorism centre-screen once more.
By late afternoon, no claim of responsibility for the attack had been made. But social media and messaging channels used by Isis were predictably awash with crowing celebrations of the deed soon after news of it broke.
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