Emergency services were called to High View Parade nearly a week ago (Credit: Google Maps)
The victim was repeatedly stabbed in his abdomen and torso in High View Parade shortly before 3pm on Tuesday, 23 March.
He was rushed to hospital where he remains in a critical but stable condition.
Witnesses saw a male wearing a balaclava get out of a red Range Rover Evoque prior to the attack.
“A 15-year-old boy was attacked in broad daylight in a busy area of Ilford and he still remains in hospital,” said Detective Sergeant Tricia-Gay Crosdale.
“I’m confident that someone saw something and we need hear from you. This was a violent attack and the people who orchestrated this attack are still in the community.
“We need to know who the people were getting out of a red car which we believe is a Range Rover Evoque.”
Three males, aged 18, 16, and 15, were previously arrested on suspicion of grievous bodily harm. They have all since been released under investigation.
Any witnesses or anyone with information is asked to call police on 101 or contact via Twitter @MetCC quoting CAD4541/23MAR.
To give information anonymously contact Crimestoppers on 0800 555 111.
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