'One ISIS attack every 84 hours' spurs dread and anger in Europe

In the past week I have seen flowers and candles carpeting a street in Munich, the tranquility of a small Bavarian town shattered by a suicide bomb and a small church in suburban France sealed off after its octogenarian priest had his throat cut. Before these horrific events, there was a knife-wielding teenager on a German train. And before that, much deadlier attacks in Nice, Brussels and last November, in Paris. This year has seen an accelerating pattern of attacks linked to ISIS in Europe and beyond -- from Turkey to Bangladesh, the United States to Indonesia.

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