Sir Keir Starmer has said “Britain faces a new threat” and terrorism has changed in light of the Southport attack last summer.

Speaking the day after Axel Rudakubana, 18, admitted murdering three young girls at a Taylor Swift-themed dance class, the prime minister said “terrorism has changed” at a news conference in Downing Street.

“In the past, the predominant threat was highly organised groups with clear political intent. Groups like al Qaeda. That threat, of course, remains,” he said.

“But now, alongside that, we also see acts of extreme violence perpetrated by loners, misfits, young men in their bedroom accessing all manner of material online, desperate for notoriety, sometimes inspired by traditional terrorist groups, but fixated on that extreme violence seeming only for its own sake.”

Politics latest: PM takes on claims of ‘cover-up’ over Southport attack

He added: “If a law needs to change to recognise this new and dangerous threat, then we will change it and quickly, and we will also review our entire counter-extremist system to make sure we have what we need to defeat it.”

The PM announced Sir David Anderson KC, an independent reviewer of terror legislation, has been appointed as the new independent commissioner for Prevent, the UK’s anti-extremism scheme.

After his guilty plea, it emerged Rudakubana was referred to the Prevent scheme three times in the 17 months before the attack over concerns about his fixation with violence but a judgement was made that he did not require intervention.

Sir Keir said the Southport killings “must be a line in the sand for Britain” and there must be “fundamental change” in how the country protects its children.

“The senseless barbaric murder of three young girls in Southport is a devastating moment in our history. No words come anywhere close to expressing the brutality and horror in this case,” he said.

Hours after Rudakabana’s guilty plea, Home Secretary Yvette Cooper announced an inquiry into the stabbings would take place.

Sir Keir said an inquiry was needed “because we are dealing with a new cohort, a new different threat, this individualised extreme violence”.

He said the government would not wait until the inquiry finished before making changes, adding: “We need to get on with the change in the meantime and to reassure the public that every step has been taken to protect their children.”

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‘I would never disclose details that could collapse a trial’

The prime minister also said he knew Rudakubana was known to the authorities and referred to Prevent when the attacks happened, but he could not reveal that at the time because it risked collapsing the trial.

“The vile individual who committed these crimes would have walked away, a free man, the prospect of justice destroyed for the victims and their families,” he said.

“I would never do that, and nobody would ever forgive me if I had. That is why the law of this country forbade me or anyone else from disclosing details sooner.”

Following the killings, misinformation online, claiming the killer was an asylum seeker who had recently arrived by small boat, prompted riots across the UK.

Sir Keir’s critics accused him of a cover-up but the PM said if he had revealed Rudakubana’s background the only losers would have been the victims and their families.

But he admitted the state had failed to identify the teenager was a serious threat.

“There has been a failure here, and I don’t intend to let any institution of the state deflect from their failures,” he said.

A history of violence

On Monday, Rudakubana unexpectedly pleaded guilty to murdering Alice da Silva Aguiar, nine, Bebe King, six, and Elsie Dot Stancombe, seven, on 29 July last year on what was due to be the first day of his trial.

Rudakubana also admitted to 10 counts of attempted murder and possession of a kitchen knife during the attack in the Merseyside town.

A week before the attack, Rudakubana, then 17, booked a taxi to take him to his old school, Range High School in Formby, but his father stopped him from leaving, it is understood.

The teenager, who has been diagnosed with autism spectrum disorder, was expelled from the school in about 2019 over claims he was carrying a knife after telling Childline he was being racially bullied and brought the knife to protect himself.

It is understood that, after his exclusion, he returned to the school to target a former bully or someone he had a grievance with and assaulted someone with a hockey stick.

Rudakubana then attended two specialist schools, where teachers were concerned about his behaviour.