Detectives investigating a stabbing at a high-profile music awards show today released CCTV images of the suspected knifeman.
Revellers fled in terror after a man was stabbed in the neck at the 6th annual Urban Music Awards at London's indigO2 venue last November.
Images from CCTV cameras at the venue, which is beside the larger 02 Arena, in Greenwich, show chaotic scenes in the aftermath of the attack.
Police need help identifying a black man wearing dark clothing captured on camera as he ran out of the premises.
Detective Chief Inspector Mark Stockford, who is leading the inquiry, said some witnesses have yet to come forward.
He said: "This was a shocking attack during a high profile event attended by many people.
"We have spoken to a large number of witnesses, but I am convinced there are still people out there with information who haven't yet come forward.
"I appeal to them to get in touch with us.
"In particular, I want to hear from anyone who recognises the man pictured, seen running from the scene.
"He has not yet been identified and may have information vital to the investigation."
Police were called shortly after 10pm on Saturday 15 November to reports of violence inside the venue.
Eyewitnesses said blood covered the floor after a huge brawl involving up to 30 people broke out, sending champagne bottles and chairs flying.
Paramedics discovered a 27-year-old man with stab wounds to his neck. He received hospital treatment and was later discharged.
A 22-year-old man was also taken to hospital for treatment to minor injuries and discharged a short while later.
Investigators sealed off the venue, keeping 300 people inside until the early hours of this morning.
The event, which featured nominations for performers including Leona Lewis, Estelle, Adele, Dizzee Rascal and Duffy, was abandoned after 90 minutes.
A 21-year-old man arrested at the scene remains on bail pending further inquiries.
* Anyone with information should contact Greenwich CID on 0208 284 9591 or Crimestoppers on 0800 555 111.