A 17-year-old, arrested on suspicion of the attempted murder of Jason Isaacs in Northolt, has now been arrested on suspicion of murder following the teenager's death.
Police were called to reports of a stabbing in Newnham Close shortly before 10.30pm on November 18 where they found 18-year-old Mr Isaacs suffering from multiple stab wounds.
The teenager victim was reportedly attacked by four people riding two mopeds during a “brutal and apparently pre-planned attack", said a spokesman for the Metropolitan Police.
The 17-year-old, who cannot be named for legal reasons, was arrested on Thursday (November 30) and was taken to a west London police station where he currently remains in custody.
Almost two weeks after Mr Isaacs' death, Detective Chief Inspector Noel McHugh made another appeal for anyone who witnessed the attack to come forward.
After the fatal stabbing on November 18, Mr Isaacs was taken to a London hospital where he remained critical for some time before passing away on November 21.
A post-mortem examination carried out on November 24 found the cause of death to be a stab wound.
DCI McHugh added: “I know that there are people who know who the suspects are and it is vital that we hear from those people without delay.
“A young man has lost his life, your information will make a huge difference and get justice for Jason's family and help us remove these dangerous individuals from your community.
“Anyone providing information that leads to a prosecution could be eligible for a police serious crime reward of up to £20,000.”
Jason's mother said: “Our amazing, beautiful Jason went out with friends for a night out and a few drinks. He should have come home to his loving family, instead he was brutally attacked – he never stood a chance.
“Our lives are in pieces. Every piece of information is really important. For Jason, make that call, thank you.”
Police are also keen to hear about any other victims who may have been threatened, robbed or assaulted by these four moped criminals but may not have reported the crime.
Anyone with information is asked to call the police incident room on 020 8785 8099.
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