Anti-terror bosses today face tough questions over how the ex-London Underground, KFC and Topshop worker managed to slip through the net before carrying out Saturday night’s atrocity, killing seven people and injuring dozens others.
The 27-year-old manic, who Express.co.uk has decided not to name, was pictured lying dead wearing an Arsenal shirt after armed police gunned down him and two other terror thugs.
It is has now been revealed the home-grown jihadi was twice reported to anti-terror authorities after he was apparently brainwashed by watching extremist YouTube videos.
The news comes after it emerged one of the ISIS attackers was found with an Irish ID card when he was shot.
The attacker appeared in a Channel 4 documentary London Bridge terror: Scenes as armed police respond Sun, June 4, 2017
At least two people have died after being after reportedly being struck by a van on London Bridge on Saturday night.
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Armed police responding to the incident at London Bridge
I did my bit, I know a lot of other people did their bit, but the authorities did not do their bit
He even appeared in a Channel 4 documentary last year about British jihadis where he was filmed alongside two notorious preachers.
At one point the Muslim terrorist is filmed involved in an altercation with police after an ISIS flag was unfurled in a park.
It is also claimed police were warned about the Muslim terrorist, understood to be one of three men behind the stabbing rampage, radicalising children in a local park two years ago.
The attackers, who wore fake suicide bomb vests, used a van to mow down pedestrians before going on a rampage with knives in Borough Market, slitting the throats of innocent revellers.
One was heard by witnesses yelling: “This is for Allah.”
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A group of men appear to pray and stand behind an ISIS flag
A former friend of the Watford-born father-of-two said he had contacted police in Barking, east London, about the extremist’s views after he discussed ISIS-inspired terror attacks.
He told BBC’s Asian Network the 27-year-old 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 its very radical.
“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.”
Colonel Richard Kemp, speaking on what the options are available to police once they are aware said: "The ideal thing to do is prosecute them and put them behind bars before they get to the stage of an attack.
"But clearly, as we've seen in virtually every attack that's taken place in Europe, we've known who these people are, but we haven't done anything about it.
"That's partly because the evidence we have against them is not evidence we would be able to use in court.
"Therefore we have to do something else, and that would be getting them out of the country; if they are non-British citizens they have to be deported back to where they came from."
The attacker was filmed unfurling an ISIS flag
But the terrorist was not arrested and allowed to keep his passport.
The unnamed man added: “I did my bit, I know a lot of other people did their bit, but the authorities did not do their bit.”
The terror thug lived in a block of flats with his wife and two young children, which was raided by police early on Sunday.
Neighbour Erica Gasparri also sensationally claimed that she reported the jihadi to the police after he tried to “brainwash” her children.
The mother-of-three said her children came home from a local park and said “Mummy I want to become a Muslim”.
She told the Telegraph: e was trying to radicalise the children, he would go down to the park and talk to them about Islam.
“He also came to the houses and gave the kids money and sweets during Ramadan.”
The attacker was pictured wearing an Arsenal shirt as he was left dead on the floor
A YouTube video also shows the extremists in Islamic dress as he berates the police outside a London mosque.
Another shocked neighbour, Ken Chigbo, 26, described him as “really sociable” and said the killer had invited him to a BBQ last week.
He said: "I know he was quite a devout Muslim, I heard him talking about the Koran.
"He would preach to young Muslims at the flat.
"Sometimes up to six people quite regularly.”