A teenage Isis supporter who claimed he would launch a stabbing attack on a London train has been jailed.

Haider Ahmed was 16 when he was reported to police, who discovered he had purchased a large hunting knife while planning to commit either a terror attack or robbery to fund his travel to Syria.

In a message sent to contacts in September 2016, he said he would launch a “martyrdom” attack the next day if he had the “equipment”.

“I wanna do inghamasi [martyrdom operation] here inshallah, I’m 100% serious,” Ahmed wrote. “I came home on train today and even imagined doing it.”

Ahmed, now 19, was jailed for five years at Kingston Crown Court for preparation of terrorist acts and helping a fellow Isis supporter to join the group in Libya.

UK terror plots that were foiled by security services Show all 14 1 /14 UK terror plots that were foiled by security services UK terror plots that were foiled by security services Oxford Street terror plot Lewis Ludlow was jailed for life in March 2019 for planning a 'spectacular multi-victim attack' on Oxford Street in London. He pleaded guilty at the Old Bailey last year to plotting an attack in the UK and funding Isis abroad EPA UK terror plots that were foiled by security services Rosie Cooper MP plot Jack Renshaw admitted plotting to kill his local Labour MP with a machete in June 2018. Renshaw bought a 19in machete intending to use it to kill Rosie Cooper, MP for West Lancashire. His plan was foiled by whistleblower Robbie Mullen, who heard of the plot in a meeting of alleged and convicted National Action members in the Friar Penketh pub in Warrington Hope Not Hate UK terror plots that were foiled by security services 'Poppy terror plot' Nadir Ali Sayed, his cousin Yousaf Shah Syed, and Haseeb Hamayoon, were charged with terrorism offences over an alleged plot to behead a member of public. The trio were arrested in London and High Wycombe, Buckinghamshire on 6 November - three days before Remembrance Sunday in 2014 PA UK terror plots that were foiled by security services National Action arrests Following the arrest of six men in 2018 on suspicion that they were members of the banned far-right terror group National Action, two were jailed. Christopher Lythgoe was found to be leader of the banned group and jailed for eight years, while Matthew Hankinson was jailed for six years. While it was found that Lythgoe did not encourage Jack Renshaw's plot to kill a Labour MP, the judge noted that he "did nothing to stop or discourage" the attack PA UK terror plots that were foiled by security services Shane Fletcher A self-described 'loner', Fletcher planned to kill members of the public at a football match in his home town of Workington. He had been referred to the government's Prevent programme nine moths prior to his arrest after stating that he dreamed about "shooting up a mosque" PA UK terror plots that were foiled by security services Heathrow airport arrests A 19-year-old from Coventry man was arrested at London's Heathrow airport on suspicion of preparing for acts of terrorism in November 2014 UK terror plots that were foiled by security services Extradition of Abu Hamza Radical muslim cleric Abu Hamza was extradited to the US in 2014 after having been jailed in the UK for 7 years for 11 offences under the Terrorism Act Getty UK terror plots that were foiled by security services South East Counter Terrorism Unit arrests Six people were arrested on suspicion of terrorism offences after a series of dawn raids in the south of England in October 2014. Three men and three women were detained separately in two properties in Portsmouth, one in Farnborough and one in Greenwich following an operation by the South East Counter Terrorism Unit. Counter-terror officers said they had disrupted what was believed to be the early stages of what could have turned into a “significant plot” PA UK terror plots that were foiled by security services October 2014 arrests Three men were arrested in central London on 13 October as part of an investigation into Islamist-related terrorism. The arrests come nearly a week after five men were arrested in dawn raids that Whitehall officials said “may have foiled the early stages” of a plan to attack the UK Peter Macdiarmid/Getty UK terror plots that were foiled by security services Anjem Choudary arrest Anjem Choudary, the radical activist and co-founder of the banned al-Muhajiroun group, was arrested in September 2014 as efforts intensify to disrupt the ideological backers of young British Muslims travelling to fight in foreign conflicts. Mr Choudary was among nine men held on suspicion of supporting a banned terrorist group and encouraging terrorism. The arrests came shortly after Mr Choudary fired off a series of angry tweets after David Cameron called on MPs to back air strikes against Islamic State militants in Syria Oli Scarff/Getty UK terror plots that were foiled by security services North West Counter Terrorism Unit funds seizing Police seize £250,000 of cash intended to fund Isis at Manchester Airport and north-west ports. Using powers under the Terrorism Act, the money was confiscated by officers from the North West Counter Terrorism Unit in Ocotber 2014 Getty UK terror plots that were foiled by security services Tarik Hassane arrest A medical student who was offered a place at a London university has been named among four men who are being questioned by counter-terror police after a series of raids across the capital. Tarik Hassane, 21, is believed to have been Tasered when he was arrested on suspicion of being involved in a "significant" Islamist terror plot on 7 October 2015 UK terror plots that were foiled by security services Abu Qatada removed from UK Radical preacher Abu Qatada will not be returning to the UK after being cleared of terror charges in Jordan in 2013 Reuters UK terror plots that were foiled by security services Haider Ahmed knife plot Teenage Isis supporter Haider Ahmed purchased a 15ins hunting knife and threatened to launch a stabbing attack on the Tube. Prosecutors said he may alternatively have been planning to rob someone with the weapon to fund his travel to fight for Isis in Syria He was jailed for preparing an act of terrorism in June 2019 Counter Terrorism Policing South East

The teenager, of Redhill in Surrey, pleaded guilty to six offences, including disseminating terrorist propaganda and collecting terrorist information.

He denied a further charge of preparing for a terrorist act, after purchasing the “terrifyingly large” hunting knife, but was found guilty by a jury in March following a retrial.

Detective Chief Superintendent Kath Barnes, head of Counter Terrorism Policing South East, said the investigation was triggered by a member of the public who contacted police with concerns about Ahmed’s behaviour.

“The prosecution case was that he was acquiring that knife for one of two purposes and probably hadn’t set his mind either way,” she told The Independent.

“It was either to go on to a train and stab a lot of people, being martyred himself in the process. Or in order to commit a robbery, and the only reason he would want to do that is to raise funds in order to travel to a conflict zone and fight for Isis.”

After police arrested Ahmed in July 2017, they found he had watched Isis videos including executions, missile attacks and a graphic guide to “slaughtering a disbeliever” using a knife.

Ahmed used encrypted networks, along with false names and details, to have regular discussions about extreme material with other Isis sympathisers.

Prosecutor Ben Lloyd described him as a “young man with a radical, dangerous and entrenched mindset who was in contact with others of a similar mindset in other countries”.

A selfie Ahmed took at London Bridge railway station (Counter Terrorism Policing South East)

Ahmed had taken screenshots of Isis propaganda showing explosives being used to behead a prisoner, sending the image to a contact with the caption: “Some spy got beheaded.”

In August 2016 he sent images of a man being shot in the back of the head to a number of people with the message: “Watching on TV HD lol.”

The court heard that Ahmed bought a 15-inch knife for £25 and had it delivered to his parents’ home where he lived in Surrey.

A similar knife had been featured in an Isis video he downloaded that featured advice on weapons to use in a “lone wolf” attack and where to stab someone.

In a message to an extremist sympathiser, Ahmed also said he wanted to rob a boy at college of his Rolex with the “massive” knife.

After his arrest, Ahmed claimed he wanted the weapon because he was interested in knives and afraid of being hurt by a boy at his school, but police found no evidence to support his account.

A conversation from Ahmed’s phone (Counter Terrorism Policing South East)

Judge Peter Lodder QC called it a “terrifyingly large and vicious looking weapon of the upmost dangerousness”.

“Your intention was to commit a robbery in order to finance terrorist activity by travelling abroad,” he added.

The judge subjected Ahmed to an extended licence when he is released and expressed hope that he would take part in a deradicalisation scheme.

Ahmed was also in contact with members of Isis abroad and had helped facilitate the travel of a man calling himself Carl Drogo from Nigeria to Libya to fight for the group.

After the man arrived in Libya in April 2016, he sent Ahmed photos and the teenager wrote back that he dreamed of going to the region to fight.

Defence lawyer Andrew Hall QC described Ahmed as an “isolated boy who was radicalised, groomed and brainwashed from the age of 15” but who now rejects his previous extremist views.

Ahmed helped an Isis supporter who called himself ‘Carl Drogo‘ travel to fight in Libya (Counter Terrorism Policing South East)

Mr Hall said the teenager comes from a decent family with a moderate faith background who are ”appalled by his behaviour and unable to understand how he was brainwashed”.

DCS Barnes said Ahmed was an “Isis supporter through and through” despite his young age.

“Our indication is that his radicalisation has definitely been online,” she added. “This was a young man who, by the time he came to our notice, was very firmly grounded in his ideology.”

A 24-year-old man from London also stood trial accused of arranging funds or property for the purposes of terrorism, but was acquitted.

Sue Hemming, from the Crown Prosecution Service, said: “Despite his young age Ahmed is a committed supporter of Isis and was prepared to carry out a terrorist act in the UK.

“He had a gruesome interest in violent images and enjoyed watching videos of people being shot and beheaded by Isis.