Tayvon Etefia and Emmanuel Popoola, both 18, were found guilty of murdering Keanu Harker in a shooting linked to a gang dispute on social media at the Old Bailey following a six week trial.
The court heard that Mr Etefia was riding an e-bike with Mr Popoola as a passenger when the latter shot Mr Harker in the head and chest on June 26 2025.
Mr Harker, who was riding a bicycle, was taken to hospital but died later that evening.
Footage released by the Metropolitan police shows the moment that Mr Etefia was apprehended having boarded a Eurostar train to Paris in an attempt to flee just days after the killing.
He had booked himself a ticket on June 29, with the train due to leave at 8.31pm.
However, detectives had been tracking his spending, and shortly after he boarded the train, officers also boarded him and arrested him at 8.29pm - just two minutes before it had been set to depart.
The footage shows officers asking Mr Etefia to show them his passport, before they escort him off the vehicle.
He can then be seen being marched down the platform at St Pancras in handcuffs, as they train he had hoped to be fleeing on sets off for its destination in the other direction.
Mr Popoola had already arrived in Paris, but he was intercepted by police after his girlfriend, 19-year-old Anais King, left to join him in the French capital.
Monitoring her movements, French police later followed Ms King to Mr Popoola’s apartment, where he was arrested and subsequently extradited from France to London.
Ms King was also arrested on suspicion of assisting an offender on her return to St Pancras station.
The court had heard that the killing stemmed from a rivalry between two Enfield gangs, the 3×3 gang and Get Money Gang (GMG).
Jurors were told the murder of Mr Harker followed an argument on Snapchat in which comments were made suggesting Mr Popoola could not afford mobile data for his phone.
The Old Bailey also heard that, in the aftermath, gang members later boasted about the killing in drill rap videos shown to the jury.
After shooting Mr Harker, the pair sped off toward Enfield Town Park, where they dumped the e-bike, discarded clothing and Mr Etefia got rid of a machete in a neighbouring garden.
Eyewitnesses saw them walking away from the park, noting that both were wearing balaclavas despite it having been a hot day in June.
A woman saw that one of the men - who police later established from CCTV enquiries was Mr Etefia - had stripped to shorts and t-shirt, and had a gun-shaped object in his pocket.
They were collected by associate Eliezer Mbaki, 25, in a black Ford Focus and driven away.
A then 16-year-old boy, who had been with the killers earlier in the evening, was sent to Enfield Town Park to recover the e-bike.
After combing hundreds of hours of CCTV footage from the area, officers were able to identify Mr Etefia and Mr Popoola as the men on the e-bike.
Footage showed the men speaking with friends at a sports court in Enfield Town Park minutes before the murder, with Mr Popoola showing off an item inside a plastic bag he was holding. Detectives believed the bag concealed the gun that killed Mr Harker.
Mr Mbaki, Ms King, 19, and a 17-year-old boy, who cannot be named for legal reasons, have been convicted of assisting an offender.
Mr Popoola, Mr Etefia and Mr Mbaki will be sentenced on Thursday July 9 and Friday July 10, with the other defendants being sentenced on a later date.
Mr Harker’s family have spoken of their “unimaginable heartbreak” following his death, and urged young people to turn away from gang culture, warning that urgent action is needed to prevent further tragedies.
In a statement, they said: “Our son had just turned 18 when these individuals decided to take his life. We are grateful that some measure of justice has been served, but no amount of time they spend in prison will ever be enough for us. We have been left with a lifetime of pain and loss that can never be undone.
“We hope this case opens people’s eyes to how damaging gang culture has become for young people. Too many children are losing their lives, and too many families are being left to suffer unimaginable heartbreak. Something must change before more young lives are taken and more parents are forced to endure the pain that we now live with every day.”
The statement added: “While nothing can ever bring our son back, we hope that his story serves as a reminder of the devastating consequences of violence and that it encourages people to help prevent other families from experiencing the same heartbreaking loss.”
Detective Chief Inspector Lucie Card, who led the investigation, said: “This is a tragic case that yet again demonstrates why our commitment to tackling serious violence is so important.
“Our painstaking investigation established that Keanu was murdered because his killers took offence to something that was said in a social media group chat.
“Rather than ignore the comments, Emmanuel Popoola armed himself with a pistol and with the help of Tayvon Etefia carried out a drive-by shooting. This was cowardly and disproportionate violence that has understandably shocked the community.
“We spent months building a comprehensive case against the killers and those who tried to help them, and I am pleased to have been able to secure justice for Keanu’s family.”