Britain is facing a Muslim terrorist threat as unrelenting as it is unprecedented, MI5 chief warns

Jihadis can ‘accelerate from inception to planning to action in just a handful of days’

Britain is experiencing a terrorist offensive which is as unrelenting as it is unprecedented, drawing from a growing pool of Islamist extremists, and with some murderous plots taking just a few days from inception to the point of attack, the head of MI5 has warned.

Andrew Parker, the director general, said he had never faced such a high tempo of attempted and successful bombings, shootings and stabbings in his 34 years of working in the Security Service.

With jihadis returning from fighting in Isis ranks in Syria and Iraq, and the internet providing motivation and material, the pace of violence shows no sign of falling.

Charting the scale of the problem, Mr Parker said that MI5 and police have stopped seven attacks by Islamists in the past seven months. Twenty major acts have been detected in the past four years and 379 suspects have been arrested in the first six months of this year.

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