Police were called at 8.52pm on Sunday, 22 November to Westgate Street, E8 following reports of a shooting.
Officers attended with colleagues from the London Ambulance Service (LAS) and found a 32-year-old woman suffering from a gunshot injury.
CPR was administered at the scene by officers prior to LAS arrival. She was then taken to an east London hospital; her condition has now been assessed as critical but stable.
Her family are with her and they continue to be supported by a dedicated family liaison officer.
Detectives from Specialist Crime North (Trident) are investigating, led by Detective Inspector Matt Webb.
He said: “Our investigation into this terrible crime continues at pace. We have spoken to a number of people and been contacted by local residents who have been disgusted by this horrific incident and have wanted to share with us what they know.
“I would like to thank those people, and reassure them that we are working 24/7 and will stop at nothing to find the person or persons who left this woman so seriously injured.
“At this stage in our enquiries we believe that approximately ten people were together in Broadway Market, E8 about ten minutes before this offence occurred. It appears the group were being filmed for the purposes of a music video, with professional looking camera equipment.
“It then appears that the group have become involved in an altercation with another group of people who arrived at the scene – during this incident one of the groups produced and discharged a firearm – both groups then fled the scene.
“The victim was an innocent bystander and left seriously injured in the street. She was assisted by members of the public before police began first aid prior to the arrival of LAS.
“Police must work with communities to catch criminals and this incident is an example of how important that is right now. Someone knows who did this; I say to those people, please do not help violent criminals by remaining silent.
“If you witnessed the incident or have information about the filming of this video, or any other information, video, or images that could help us, please call our incident room number on 0207 230 9737 quoting either Op Halifaxa or CAD 6587/22NOV20.”