Police made 441 terror-related arrests last year - the highest number since records began.

In a stark warning of the threat the UK continues to face, the number of arrests under terrorism laws rose by 17 per cent in the year ending March 31, 2018.

The arrests included 23 arrests in connection with the Manchester Arena bombing, 21 over the London Bridge atrocity, seven over Parsons Green and one in connection to the Finsbury Park attack.

Stats show that 114 of the 411 arrested were charged with terror offences, but only 41 ended up being prosecuted, with 37 of them convicted.

British police made more than 440 terrorism-related arrests last year, new stats show

A graph released by the Home Office shows the number of terrorism arrests rising almost every year since 2010. The number charged is shown at the bottom of each column

Today's figures mean the total number of terror-related arrests in Britain since the 9/11 attacks in 2001 has now passed the 4,000 mark, standing at 4,182 as of the end of March.

The figures show that the number of women arrested for terrorism is also at an all-time high, at 56 over 12 months.

The report published by the Home Office today states: 'As in previous years, and similar to other types of crime, the vast majority of those arrested for terrorism-related activity were males.

'However, 56 of the 441 arrests were females (13%), the highest number arrested in a financial year since the data collection began, and the highest proportion since the year ending March 2016.

'Since September 2001, when the collection began, females have accounted for 9% of arrests.'

The increase in the number of women arrested comes in the year in which Britain's youngest ever female terrorist, Safaa Boular, was convicted of plotting a knife attack at the British museum with the help of her mother, Mina Dich, and older sister, Rizlaine Boular.

Safaa Boular, her mother, Mina Dich, and older sister, Rizlaine Boular, were arrested and now face jail for plotting a knife attack at the British Museum. Overall the number women arrested for terrorism offences rose to its highest ever level

A graphic from the report shows that only 37 of the 114 people arrested ended up by convicted of terrorism-related offences

The statistics also show the breakdown of the nationalities of those arrested since the 9/11.

Nearly 2,500 of those detained have been British, as well as 183 Algerian, 165 Pakistanis, 158 Iraqis, 89 Afghans, 83 from Iran and 77 from Somalia.

The number of people in prison for terrorism offences has also risen 27 per cent to 228, the highest since records

As at 31 March 2018, there were 228 persons in custody in Great Britain for terrorism-related offences, an increase of 27% on the 180 persons in the previous year.

The report stated: 'This continues the upward trend seen in the last few years [and] was the highest number of persons in custody for terrorism-related offences since the data collection began in 2009.

'Of those in custody, the majority, 82%, were categorised as holding Islamist extremist views, a further 13% as holding far right-wing ideologies and 6% other ideologies.'

Among those arrested this year were Finsbury Park attacker Darren Osborne and Ahmed Hassan, whose homemade bomb failed to detonate properly on a tube train in Parsons Green

Also detained were Umar Haque (left), who encouraged children to carry out attacks in London, and Husnain Rashid (right), who called for attacks on, among others, Prince George

Scotland Yard said it has foiled 12 terrorist plots since March 2017 and has around 600 active investigations ongoing.

Responding to today's report, Met Police Assistant Commissioner Neil Basu said: 'With the terrorist attacks of 2017 we saw a genuine step-change in momentum. As a result, our operational activity increased to meet the new and emerging threats we now face.

'A year on and our activity continues to be at unprecedented levels; shown, not least, by the fact that, in the past year, working together with the security services we have stopped an average of one terrorist attack every month.

'Police, together with the security services, are determined to make the UK as hostile an environment for terrorists as possible.'