A prisoner is on the run after he “overpowered and evaded” escort officers who were taking him to court.

Jamie Cooper, 33, fled the prison van on the M55 motorway near junction two by Catforth, Preston, at about 8.54am on Wednesday, Lancashire Police said.

The vehicle was taking Cooper and other inmates to Lancaster Magistrates Court.

GEOAmey, which was providing the secure transportation service, has said its vehicle had to pull over on the M55 to deal with an “onboard medical emergency”.

The company added: “The detained person involved in this emergency then overpowered and evaded the escort officers and escaped from the vehicle. Lancashire Police have been informed and are currently searching for the escaped prisoner.”

Cooper, from Blackpool, is described as 5ft 7ins tall, of medium build, with short, cropped hair, and is thought to be wearing a blue coat, blue jeans and black trainers.

Cooper has links to Blackpool and Bolton, Lancashire Police added.

Officers have urged the public to call 999 if they see him.

The force also advised people not to approach Cooper.

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Lancashire Police said in a statement: “We know that this may be concerning to hear about, but we want to reassure you that incidents like these are extremely rare in Lancashire and it is something we are taking incredibly seriously.

“Searches and an investigation are ongoing, and you will see an increase in our officers in the area as they continue their enquiries.”

A teenager who was planning a mass shooting at his old primary school has been jailed for life with a minimum term of 49 years for murdering his family.

Nicholas Prosper, from Luton, pleaded guilty to the murder of his mother, Juliana Falcon, 48, and his siblings, Kyle Prosper, 16, and 13-year-old Giselle Prosper at Luton Crown Court in February.

In sentencing, the judge said the words “heartless and brutal” were insufficient to describe the horror of the last moments suffered by his victims.

Their bodies were found at their flat in the town in September last year.

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The 19-year-old planned to carry out a mass shooting at St Joseph’s Catholic Primary School, where Prosper and his siblings had been pupils, he admitted to police.

The court heard his aim was to be known as “the world’s most famous school shooter of the 21st century”.

Police believe he killed his family when his mother found a shotgun he had bought using a fake certificate and confronted him.

His scheme was eventually foiled by officers who spotted him in the street immediately after the murders and arrested him.

The loaded shotgun was found hidden in bushes nearby, along with more than 30 cartridges.

As his sentencing started on Tuesday, the court heard that “his planning was cold, deliberate and without sympathy or emotion towards the actual victims or potential victims”.

Judge Mrs Justice Cheema-Grubb said the details of Prosper’s case were “chilling”, and that he had wanted to emulate and outdo the US school massacres at Sandy Hook in 2012 and Virginia Tech in 2007.

His “main wish”, according to the prosecution, was notoriety, telling a prison nurse “I wish I had killed more”.

Mrs Justice Cheema-Grubb said Prosper had not hated his mother or siblings and had “had a good life with them”, but that his intention had been to kill them in their sleep and rape his sister.

“Each victim suffered the anguish of anticipating or being aware of the deaths of others,” she said.

In explaining why she had opted not to impose a whole-life sentence, the judge said: “A minimum term does not in any way equate to the value of the life of a murder victim, still less three such victims.”

She acknowledged that Prosper had autism spectrum disorder, but said she was satisfied that it did not affect his decision-making enough to be the primary reason why he carried out the killings.

“A murder spree with the sole aim of glorifying the name of the perpetrator in the history of mass killers is what you intended,” she said.

“You have also expressed no remorse and no sorrow. Indeed, when asked by the psychiatrist if you would try to commit another massacre, you replied: ‘Well, that’s their job to stop me getting the weapons if I get released’.“

Mrs Justice Cheema-Grubb added: “Your plans were intelligent, calculated and unselfish. Your ambition was notoriety. You wanted to be known posthumously as the world’s most famous school shooter of the 21st century.

“Words such as heartless and brutal are insufficient to describe the horror of those last moments of the people who were closest to you.”

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A statement from the family of the victims was read outside the court.

It said they now understood the deaths had “much more meaning and importance” because they “stopped any other family in the community going through the pain we have suffered”.

“For now, we would ask people to remember Juliana, Kyle and Giselle for the people they were. Julie was a strong, loving mother to her four children, who were her absolute world.

“Kyle was a kind and funny young man who loved football and boxing. He was a big talent with massive potential. Giselle was a beautiful soul and caring young girl with an infectious smile. She was also an exceptional pupil at school and was loved dearly by her friends.”

The final act of Juliana Falcon’s life, in the minutes before she was shot dead by her son, potentially saved dozens of others.

Realising the unthinkable about her child, her intervention was crucial in preventing him from carrying out what could have been one of the worst mass killings ever to happen in the UK.

Triple killer who murdered family jailed for at least 49 years

It was late at night when the 48-year-old interrupted her teenage son, Nicholas Prosper, in his bedroom with a gun.

He was preparing to carry out a massacre at his old primary school the following day.

Police believe Juliana spotted the shotgun and confronted her son about what he was up to, and there was a struggle as he began attacking his mother.

Her intervention changed everything.

Prosper, 18, shot his mother dead with the firearm he had bought illegally less than 24 hours earlier.

Over the next few hours in the family’s eighth-floor flat in Luton, he also shot dead his 13-year-old sister, Giselle, and shot and repeatedly stabbed his 16-year-old brother, Kyle.

The noise of the killings alerted neighbours and meant police would be on their way, so Prosper’s plan had to be brought forward.

“My f****** mum messed it up,” he wrote down while in custody. “My mother is a f****** stupid cow.”

A plan for ‘notoriety’

Prosper left the flat at 5.30am on 13 September last year, hours before the school would open.

He had meticulously researched school massacres, was fascinated by violence and led a dysfunctional life online. He craved notoriety.

He took with him more than 30 shotgun cartridges which, he had calculated, would enable him to kill more children than any other school attack.

When he was arrested, he was on his way to his old primary school to target the youngest children there, aged just four and five.

In a note he later wrote in prison, he confessed he “wanted to cause the biggest [school] massacre in the 21st century and be more famous than Sandy Hook”.

A total of 26 children were killed at Sandy Hook Elementary School in Connecticut, USA in 2012. The killer there had shot dead his own mother at home before going to the school.

Prosper’s mother’s actions in Luton, disturbing his plan early, denied him that appalling place in history.

Senior investigating officer Detective Chief Inspector Sam Khanna, of Bedfordshire Police, told Sky News that Prosper’s ambition “was most definitely notoriety… to be known as being responsible for the biggest school shooting on record.”

He had researched in detail every shooting school shooting across the world “within the last 15, 20 years,” he said.

“He’d done his sums, and he wanted to be responsible for the most amount [of deaths]. Killing his family was the first part of it. But then going to a school and killing numerous children, teachers, then finally himself.”

Concerns raised

Prosper was raised in Luton and had attended St Joseph’s Catholic Primary School, where he planned to carry out an attack three-quarters of a mile from his home.

Growing up, teachers thought he was a quiet, introverted boy, with a small group of friends who were interested in computers.

When he went to sixth form aged 16, staff noticed he had become more withdrawn.

The school raised concerns that he could be on the autism spectrum, but he refused to see a GP or accept any help.

DCI Khanna said “very little” was known of Prosper, and “there was certainly no Prevent referral”.

Prevent is the UK’s counter-terrorism programme designed to identify and stop young people being radicalised.

Both of Prosper’s parents “had expressed concerns to the school”, the detective said.

The school had shared those concerns, he said, “but because of his unwillingness to engage with mental health professionals, it didn’t go any further”.

A consultant forensic psychiatrist concluded the teenager shows “all the symptoms of Autism Spectrum Disorder (ASD)” but that it was undiagnosed at the time of the killings. He said Prosper has “an extreme lack of empathy with others and an extreme lack of remorse”.

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How did Prosper get a gun?

So how was an 18-year-old able to source a shotgun? The answer is by deception.

Prosper convinced a legitimate seller, who had only previously sold to registered firearms dealers, to deliver the weapon to him.

The teenager produced a convincing but fake shotgun certificate and paid the seller £650 in cash and an extra £30 petrol money to bring the gun and 100 shotgun cartridges to Luton the day before the killings.

Bedfordshire Police investigated and concluded the seller would not face criminal charges. He had been duped by Prosper.

DCI Khanna said Prosper “went to great lengths, looking at templates, looking at prototypes, getting police force logos, signatures, and having copies of genuine certificates, so he could produce what he thought would be good enough to enable him to obtain that shotgun – even down to the printing of the paper with watermarks”.

Prosper spent a lot of time online alone in his bedroom posting troubling comments supporting sexual relationships between adults and children and expressing other extreme views.

He had also become obsessed with the Walking Dead video game, and particularly a character called Clementine who is a vulnerable young girl.

Detectives can’t say if there is a direct link between his “avid use” of the game and the school shooting plan, but it is one aspect of a complex and unhealthy life he led online.

DCI Khanna said Prosper “certainly believed that he had some form of relationship with Clementine, albeit she’s a video game character”.

Police also found indecent images of children on Prosper’s devices.

The investigator said his online research of school massacres was persistent and extremely detailed.

“There’s a lot of talk about the dark web, but this was on the surface web and sites where… you can read manifestos of people that have done horrific acts. They shouldn’t be available to be seen.”

After his arrest, Prosper told a nurse at Bedford prison about his school massacre intentions. He had also written two detailed plans of what he intended to do at the primary school he used to attend.

“We didn’t find any evidence that he had harboured any grudges towards that particular school… it was purely around his knowledge of it,” DCI Khanna said.

After killing his family, he left home “with the right amount of cartridges to complete his plan, right down to the final detail”, he added.

“Once in prison, he has openly talked about the fact that that was his plan – to go to the school and kill children and teachers before finally killing himself.”

Prosper had chosen black and yellow clothes for the attack and as he made his way towards the school in Luton he was spotted by police officers on patrol.

They thought he was acting strangely and knew three members of the same family had been shot dead nearby.

“It’s not murder,” he repeatedly told the officers as they handcuffed him by the roadside.

Months later, he pleaded guilty shortly before he was due to stand trial.

Remembering the victims

The dilemma of whether to make his school shooting plan public has been difficult for police and prosecutors.

It is clearly deeply upsetting for the school community and they are mindful that Prosper craved attention and publicity, but it is also about challenging this kind of extreme behaviour online.

DCI Khanna’s investigation team has examined this “deeply troubling” case with the victims at the forefront of their minds.

“The family has really told us what wonderful people they were,” he said.

Juliana, he said, was “a doting mum who did a lot of work for charity and [was] a very keen runner”.

He described Giselle as “so popular amongst friends, a bright girl with an infectious smile”, while Kyle was a “funny young man, really into his sports and again very popular at school with his friends”.

Now, DCI Khanna said, the focus should be on the victims – “and how much they’ll be missed”.