Delivering his opening statement, Mr Moss said the “red tape” email was sent by Cheryl Smith, a safeguarding lead at Presfield High School in Southport, who had been trying to get the teenager to attend school for around a year.

Mr Moss said the school’s efforts “came to a head” on 21 March 2023 when Ms Smith wrote to a colleague describing how she had contacted social services, child mental health teams and the police to try and get them to intervene – all in vain.

She added: “Short of breaking in I don’t know how to see this kid.”

Mr Moss said the first phase of the inquiry would focus on three “central themes” – whether agencies “took responsibility or ownership” for his case, whether anyone was looking at the “overall picture” of his risk, and what “fundamental change” may be necessary to make the system work.

Mr Moss said the killer’s internet use and purchase of weapons – including machetes and archery equipment – would also be significant.

The inquiry has heard on the morning of the attack the teenager searched the social media platform X for “Mar Mari Emmanuel stabbing”- which brought up a graphic video showing Bishop Emmanuel being attacked in a church in Sydney, Australia.

Mr Moss said although most of his search history had been deleted, detectives found he had very recently viewed a PDF file called “excerpt from Kamikaze death poetry”.

One tablet recovered from his house included downloads of material including documents about genocide, torture and weapons, an image of Hitler and a picture of a wolf in a suit with the caption: “Just be a lone wolf bro”.

One document, which formed part of a terrorism charge Rudakubana admitted, was a study of an Al-Qaeda Training Manual – although police also found “anti-Islamic” material.

On another device police found screenshots of “very disturbing” images including graphic injuries, slavery, mistreatment of women and Nazi Germany.

The inquiry heard his behaviour at school began to “deteriorate rapidly” from the start of Year 9, when he was 13.

Teachers at the Range High School in Formby had reported incidents including hitting other children, and commenting “that’s why teachers get murdered” when he was given a detention.

He was expelled from mainstream education in October 2019 after admitting he had taken a knife to school because he “wanted to kill a bully”.

In the December, he went back to the school and attacked a pupil with a hockey stick while carrying a knife in his backpack.

This resulted in him pleading guilty to assault and carrying an offensive weapon.

Between 2019 and 2021, he was referred to the government’s counter-extremism service Prevent three times by teachers concerned at comments he had made, and internet searches for topics including “school shootings” and terror attacks.

But on each occasion, including after a multi-agency meeting with MI5, the referrals were closed by counter terrorism officers because no “terrorist or domestic extremist ideology” was identified.

Mr Moss said during that time, various teams within Lancashire County Council’s social services department opened and closed cases with him.

Mr Moss said the killer’s father, Alphonse, asked for support from social workers and mental health services when his behaviour became increasingly unmanageable.

On different occasions ahead of the attack, the teenager kicked his father, poured milk over him and threatened him with a knife, the inquiry heard.

Mr Moss also said the inquiry would also address the behaviour of certain individuals, including taxi driver Gary Poland, who dropped the killer off at the dance studio.

Dashcam footage showed Mr Poland saw the teenager enter the building at 11:45 BST. Children began to run out screaming a few seconds later.

But Mr Poland, who will give evidence at a later date, drove away from the scene and collected another fare before eventually calling the police at 12:46.

The inquiry heard he told the police he was “sorry” and had acted out of “complete shock”.

Alphonse Rudakubana had also disclosed to police that he found a bow and arrow in his son’s bedroom around a week before the attack, and had signed for deliveries of machetes his son had ordered online.

Mr Moss said the killer’s family would be questioned on what items they may have found around the house and what “steps” they took to try and recover knives.

He told the inquiry this was “particularly important” because on 22 July 2024, a week before the attack, Mr Rudakubana had stopped his son getting into a taxi to Range High School with a rucksack on, which he suspected contained a knife.

Earlier, Sir Adrian Fulford, chairman of the inquiry, promised to do everything “humanly possible” to answer the questions of bereaved families and victims.

The inquiry continues.