BRITAIN

MORE than 3,000 jihadis are in the UK – stretching the country’s security services to breaking point.

Spies and counter-terror police are struggling to monitor a flood of suspects, mainly radicalised men and women in their early 20s.

About 850 Britons are thought to have gone abroad to fight with so-called Islamic State as they took control of large swathes of territory in Syria and Iraq.

But with the terror group being pushed out, extremists with British passports are fleeing back to the UK where authorities fear they may unleash a new wave of attacks.

Although more than 100 have been killed, around half have returned home with battle experience and training in the use of explosives and firearms.

The security services have also foiled at least 13 planned attacks in the past four years. Britain’s most senior counter-terrorism officer, Acting Deputy Met Commissioner Mark Rowley, has revealed.

The figures lay bare the scale of the terror threat facing the country from extremists.

The flood of new jihadists is stretching the UK’s security services to breaking point, with up to 30 officers required to provide 24-hour monitoring of just one suspect. Restricted resources mean MI5 can watch around 50 terror suspects around the clock.

As well as sophisticated plots to bomb transport hubs and shopping centres, jihadists are being groomed – often online – to carry out ‘lone wolf’ attacks using knives and vehicles.

A chilling report also revealed that the wives and children of Islamic State fighters in Syria could be brainwashed into carrying out attacks after returning to Britain. Europol, the EU’s police intelligence agency, said many posed a grave danger because they had been radicalised and desensitised to extreme violence.

In 2016-17, there were 380 terrorism-related arrests in the UK, compared to 307 in the previous 12 months – a rise of nearly 25 per cent. Anti-terror police stepped up arrests after Muslim convert Khalid Masood killed four pedestrians on Westminster Bridge in March before stabbing a police officer to death. Meanwhile, in the past three years there were 386 terror-related convictions, according to figures from Scotland Yard.