THE Arsenal kit wearing ringleader of the London Bridge terror attack posed with a jihadi flag on Channel 4 documentary The Jihadis Next Door, was thrown out of a mosque and tried to radicalise kids in his local park in the years ahead of the devastating atrocity.

The ex-KFC and London Tube worker, known as Abz, 27, was quizzed by cops over his twisted views before he was gunned down along with his two accomplices down following the depraved assault on Saturday night.

21 Ringleader Abz from east London lays dying on the floor following hail of police bullets Credit: EPA

21 Abz pictured here turning to the camera after posing with the jihadi flag in the park Credit: C4 supplied by Pixel8000

21 The terrorist was pictured as part of a group in Regent's Park brandishing a black flag Credit: Channel 4

21 The video showed the group gathered in a London park

21 Borough Market moments after the terrorists were shot by armed police

21 The ringleader of the terror gang pictured here after being shot in Borough Market

The trio killed seven people after mowing down revellers in central London before going on a rampage wearing fake bomb vests and wielding hunting knives.

The man who went on to wage a horrific attack on people at London Bridge previously appeared in a programme called The Jihadis Next Door on Channel 4 and was also thrown out of his mosque for ranting about an election.

A former friend of the Watford-born married father-of-two has revealed he contacted police about the terror thug’s extremist views, and claims he was radicalised after watching twisted YouTube videos.

RED FLAGS ON HIS RISE TO TERROR ATROCITY:

Abz appeared on C4's The Jihadis Next Door unfurling a jihadi flag

He was thrown out of his mosque for ranting that voting in an election was “un-Islamic”

A friend contacted police about him due to concerns - he was quizzed but not arrested and allowed to keep his passport

He attempted to radicalise children in a nearby park

He was reported for a demonstration in Regents Park

The unnamed man said he contacted cops in Barking, east London, after the maniac killer discussed ISIS-inspired terror attacks.

He told BBC’s Asian Network that the jihadi had become brainwashed after watching clips of US hate preacher Ahmad Musa Jibril.

He said: “He used to listen to a lot of Musa Jibril. I have heard some of this stuff and it's very radical.

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“I am surprised this stuff is still on YouTube and is easily accessible.

“I phoned the anti-terror hotline. I spoke to the gentleman. I told him about our conversation and why I think he was radicalised.”

After confirming Abz was allowed to keep his passport and was not arrested, he added: “I did my bit, I know a lot of other people did their bit, but the authorities did not do their bit.”

WHAT WE KNOW SO FAR:

Did you see the London Bridge terror attack, or know anyone involved? Please contact The Sun newsdesk on 020 7782 4100, text 07423720250 or email exclusive@the-sun.co.uk