London Bridge Terror: Up to 23,000 jihadis in UK but authorities cannot monitor them all | UK | News | Express.co.uk

Then, it was revealed the security services had 500 live investigations into more than 3,000 suspected radical jihadis, including about 400 people who have remarkably been allowed to return to our shores after fighting with terror group Islamic State (ISIS) in Syria. But, it has since emerged a further 20,000 radical Islamists have been considered a “person of interest” to the security services at anyone time, according to a security services source.

Source: London Bridge Terror: Up to 23,000 jihadis in UK but authorities cannot monitor them all | UK | News | Express.co.uk