Butt's involvement is doubly embarrassing for police and the security services because he appeared in a TV documentary last year about British jihadis – and was also involved in a filmed altercation with police in a pair of Rayban sunglasses after he unfurled an ISIS flag in Regent's Park.
He was known to both MI5 and the police and he was still able to murder seven people
Khuram Butt was known to both MI5 and the police.
Despite being on the counter-terror watch list, there was no evidence he was planning an attack and therefore his file was not deemed a priority.
Butt's involvement is doubly embarrassing for police and the security services because he appeared in a TV documentary last year about British jihadis – and was also involved in a filmed altercation with police in a pair of Rayban sunglasses after he unfurled an ISIS flag in Regent's Park.
On Channel 4's The Jihadis Next Door he was caught on camera alongside two notorious preachers who were well known to police and intelligence officials because of their extremist views.
He was reported to the anti-terror hotline after he became radicalised by watching extremist videos on YouTube and police were later warned about the suspect radicalising children in a local park two years ago - giving them sweets and money to listen to him.
A friend said he was never contacted by the police or MI5 about his concerns, adding: 'I did my bit, I know other people did their bit but the authorities did not do their bit'.
Figures show the agency is managing around 500 active investigations involving around 3,000 individuals at any one time.
But in addition there are also a larger pool of as many as 20,000 people who have been considered at some point in the past but are not included in the live probes.
The spotlight has fallen on how closely those in the second, larger group are monitored after it emerged that the Manchester attacker Salman Abedi was a former subject of interest.
On Channel 4's The Jihadis Next Door he was caught on camera alongside two notorious preachers who were well known to police and intelligence officials because of their extremist views.
He was reported to the anti-terror hotline after he became radicalised by watching extremist videos on YouTube and police were later warned about the suspect radicalising children in a local park two years ago - giving them sweets and money to listen to him.
