Intel gathering

Spy agencies will monitor 20,000 terror suspects by computer because they don't have the manpower to track all of them at once

Spy agencies are to use computer algorithms to keep tabs on 20,000 former terror suspects because they don't have the manpower to physically watch all of them at once.

MI5 and MI6 will use the complex system to sift through massive amounts of data to alert intelligence agents to worrying behaviour, under potential plans.

A review is expected to recommend security agencies widen their searches when examining the online footprint and movement of these former jihadis.

Britain's counter-terrorism officials currently actively monitor around 3,000 people.

But following a wave of terror attacks in the UK, the Government admitted there were as many as 20,000 former subjects of interest no longer classed as posing serious danger.

Those in this pool currently have little or no resources spent on them.