Detectives are continuing to appeal for anyone with information to come forward following the murder of 18-year-old Sami Sidhom in Forest Gate.
Sami's father, Samer Sidhom, has also made an emotional appeal for information. He said: "My only son, Sami, was stabbed to death near his home as he returned from watching a football game of his favourite team, West Ham. He was only 18.
"Sami was a wonderful son. He was a kind young man who always tried to help his family, friends and colleagues, and was respected by everyone who knew him. He did everything right. He fought hard to win his place in society and some cowards in the dark stabbed him in the back.
"My son's killers are still walking the streets free of conviction or charge. I need you to provide the evidence to convict them. You know who you are and you have a choice. A choice to be someone that hides in the dark, or a brave person who sets the record straight. If you know the killers you already know they killed a perfectly innocent person for no reason whatsoever.
"He has done nothing to anyone; he was never involved in anything and had nothing to do with his killers. The only person that would stop them from doing the same to you is you. You need to stand up and provide the evidence or information that will put them behind bars for a lifetime. You owe it to yourself and to an innocent brilliant young man.
"Your statement will be treated in complete confidence and you will be rewarded. There is a reward of £20,000, but the ultimate reward is that you will get a new life where you know you stood up to the ones who would blindly destroy anything that comes their way.
"Every day they spend in freedom, Sami spends in a grave from which he'll never return. The brutality of his death is compounded by the indifference and the silence of those that can bring him justice.
"We, his family, relive his murder everyday knowing that a beloved son and an aspiring lawyer has been failed by everyone."
Detective Chief Inspector Mark Wrigley from the Met's Serious Crime Command, who is leading the investigation, said: "The investigation into Sami's death has progressed and a total of nine people have been arrested. Sami was almost home when he was attacked. I know that there were witnesses to what happened. People at the scene know who took Sami's life and why. I urge you to come forward and tell the truth about what you know.
No matter how unimportant your information may seem, it could help take a dangerous and violent criminal off of your local streets and you could be eligible for a £20,000 reward.
A reward of up to £20,000 is being offered by police for information that leads to the arrest and conviction of those responsible Sami's murder.
Police were called at approximately 22:50hrs on Monday, 16 April 2018 to reports of a stabbing in Chestnut Avenue, E7.
Officers, the London Ambulance Service and London's Air Ambulance attended.
Sami Sidhom, who was aged just 18, was pronounced dead at the scene at 23:27hrs.
A post-mortem examination found the cause of death to be multiple stab wounds.
The investigation revealed that Sami was stabbed multiple times by a number of suspects in Chestnut Avenue as he returned home from a West Ham United football match.
He got off the bus at Romford Road and was walking in Chestnut Avenue when he was attacked.
Eight people have been arrested in connection with the murder. They are:
[A] A 22-year-old man was arrested on suspicion of murder on 23 April. He has been released under investigation.
[B] A 17-year-old boy was arrested on suspicion of murder on 3 May. He has subsequently been released and no further action will be taken against him.
[C] A 21-year-old man was arrested on suspicion of murder on 4 May. He has been released under investigation.
[D] A 35-year-old man was arrested on suspicion of murder on 4 May. He has been released under investigation.
[E] A 22-year-old man was arrested on suspicion of murder on 10 May. He has been released under investigation.
[F] A 15-year-old boy was arrested on suspicion of murder on 10 May. He has been released under investigation.
[G] A 22-year-old man was arrested on suspicion of murder on Friday, 13 July. He has been released under investigation.
[H] A 22-year-old man was arrested on suspicion of murder on Monday, 16 July. He has been released under investigation.
(I) A 21 year old male arrested on 21 August on suspicion of murder. He has been released under investigation
Anyone who witnessed the incident or has any information is asked to contact the incident room on 020 8345 3715 or Tweet @MetCC.
Information can also be given anonymously by calling Crimestoppers on 0800 555 111 or visiting crimestoppers-uk.org.