Enquiries into a stabbing in Evering Road, Lower Clapton, on February 22 are still ongoing, with no arrests made yet.
Detectives believe a music video was being filmed at around 4pm when the attack happened, which may have captured some of the events that took place.
They are now keen to speak to anyone who has this footage.
Detective Sergeant Andy Rice, from the Central East Command Unit, said: “Our enquiries have established that a music video was being filmed at the time of the attack.
“I am keen to speak to anyone who has this footage as it could contain information that could assist this investigation.
“I would also urge anyone who has information that could help identify whoever is responsible to come forward and speak to us in confidence.”
An 18-year-old was taken to hospital with a “serious” arm injury after the stabbing, where he underwent emergency surgery.
His injuries were deemed not to be life threatening, and he is now recovering from his injury.
Anyone with information is asked to call police on 101, or contact them via ‘X’ @MetCC, and quote CAD4542/22Feb.
You can also provide information anonymously to the independent charity Crimestoppers on 0800 555 111.
