Police are looking for a woman who rushed to help a 26-year-old man after he was knocked out in a serious assault at the O2 Arena.
Officers think she may be the only witness with a clear view of the attack, which happened in Peninsula Square shortly before 3.30am on Sunday, February 12.
A 26-year-old man was found unconscious. He was taken to hospital for treatment where he remains in a serious but stable condition.
Two men were charged and are due to appear in court later this month. A third man has been bailed pending further enquiries.
A woman who immediately tried to help him as he was lying on the ground was caught on CCTV, and officers have said they want to talk to her.
To give information anonymously contact Crimestoppers on 0800 555 111 or crimestoppers-uk.org