MARK ALMOND: Is Islamic State now planning a new wave of attacks?

Almost a quarter-of-a-century on from the devastating terrorist attacks on September 11, 2001, America is once again haunted by the risk posed by global terrorist groups.

Nothing as grotesquely spectacular as has happened again, but yesterday's carnage in New Orleans is a grisly reminder that ghostly Islamist terrorists still lurk in Western societies, even across the Atlantic.

The mayhem caused by the attacker – US citizen Shamsud Din Jabbar, 42, whose truck carried an flag – came out of the blue, at least from the perspective of the local authorities and police.

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