Anti-terror police take down a suspect in east London during the London Bridge attack probe. Figures released today show UK police arrested a record 400 terror suspects in the last year

A Home Office statistical bulletin said: ‘As a result, the number of arrests in the year to 30 September 2017 was the highest since the data collection began.’

Just under a third of those arrested, 115 people, were later charged, with the vast majority of those charged with terrorism-related offences.

More than 200 of those arrested were were released without charge, 60 were released on bail pending further investigation and 11 faced so-called ‘alternative action’.

The increase includes a 77% rise in the number of white suspects held, from 81 to 143.

Earlier this week, a report revealed that counter-terror teams are currently running about 500 live investigations involving 3,000 individuals at any one time, while there is also a wider pool of 20,000 subjects of previous probes.

In a briefing given to the Cabinet on Tuesday, the head of MI5 Andrew Parker revealed that total of nine Islamist terrorist plots have been thwarted in the UK over the past year.