A fourth person has been arrested on suspicion of murdering schoolboy Alan Cartwright, who was stabbed to death while riding a bicycle with his friends.
Scotland Yard said an 18-year-old man was arrested this morning after attending a north London police station.
Another 18-year-old man was arrested in the early hours of yesterday morning after also attending a north London police station.
A 17-year-old boy and a 21-year-old man were also arrested in Camden, north London, yesterday morning.
Police said the three adult suspects remain in custody while the 17-year-old has been bailed to a date in mid-April.
The arrests follow an emotional appeal by Alan’s family for witnesses to come forward to help track down the 15-year-old’s killers.
Police released shocking footage of the moment the schoolboy was stabbed in the chest as he cycled with friends along a busy road in Islington, north London.
He managed to continue riding a short distance after the attack in Caledonian Road on Friday, but collapsed and was later pronounced dead at the scene.
A second suspect is shown lunging at one of the teenager’s friends and knocking him off his bike, while a third crosses the road and grabs another friend to pull him off his bicycle.
A post-mortem examination found that Alan died from a single stab wound to the chest.
His mother and sister described the Army cadet and Celtic and Arsenal fan as a “joker” who loved bikes and never caused any trouble.
Fighting back tears during an appeal on Tuesday, Alan’s mother, Michelle Watson, 39, said: “He always made you laugh about anything and everything. He was just the funny one out of his friends.
“I feel angry, I want somebody found for this. I just feel numb.”
