The figures have been released by the Home Office a day after an alleged plot to kill the Prime Minister was revealed.

The figure included 12 people detained in connection with the Westminster terror attack; 23 arrested following the bombing of the Manchester Arena; 21 detained in the wake of the London Bridge atrocity; one arrest in connection with the Finsbury Park attack and seven arrests following the Parsons Green tube attack.

Of the 400 arrests made over the year, 115 - or nine per cent - resulted in a charge.

Out of those who were charged, 97 (84%) were charged with terrorism-related offences.

However there was also a 77 per cent rise in the number of white suspects held, up from 81 to 143.

He added: "The statistics we are publishing today demonstrate the breadth of work that they undertake, alongside the rest of the criminal justice system, day in and day out to keep us safe".

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"The public must remain alert but not alarmed and report any suspicions they have about unusual activity or behaviour to the appropriate authorities".

The Islamic extremist threat to the United Kingdom is at an unprecedented scale and has increased "dramatically" over the past year, MI5 Director-General Andrew Parker revealed last month.

"That threat is multi-dimensional, evolving rapidly, and operating at a scale and pace we've not seen before..."

"Today there is more terrorist activity, coming at us more quickly, and it can be harder to detect", he said.

Ms Rudd has said she is planning to toughen up penalties for those found viewing terrorist propaganda online.