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The first alleged ISIS-linked terrorist plot on UK soil has been foiled by police and MI5 amid fears that jihadists are returning from Syria to carry out beheadings on British streets.

Four men were arrested in armed raids in London during which one suspect was Tasered by police.

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The men are feared to have been in the “early stages” of planning a “significant” attack and it is understood that one line of inquiry is whether they wanted to emulate the sort of brutal execution that has become ISIS’s hallmark on a British street.

The Daily Telegraph understands one of the men arrested had returned from Syria and had links with ISIS – possibly as a fighter there.

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Police and intelligence agencies have become increasingly concerned that the terror group, which has already beheaded four Western hostages, including Britons David Haines and Alan Henning, is encouraging similar attacks overseas.

Fears have heightened after the UK joined air strikes against the terrorists.