A woman was stabbed in the leg as she left a boat party in the early hours of the morning.
Police were called to a footpath by the River Lea Canal in Newham shortly after 5am on July 16.
The London Ambulance Service treated a 36-year-old woman for a stab injury to the leg before taking her to hospital. Her condition has been assessed as not life-threatening.
A police spokesperson said that no arrests have been made in the investigation but that officers are searching for a suspect described as black and 6ft 2in tall with dreadlocks.
Detective Constable Ben Taylor, the investigating officer, said: "We believe the victim was leaving a party that had been held on a boat when she walked past a group of men and then felt a sharp pain in her leg.
"She realised she had been stabbed but the suspect had left the scene.
“Our enquiries are ongoing but I urge anyone who was there, especially at the event, and may have captured images and video, to make contact with us immediately."
Anyone with information that could assist police is asked to call 101 or @MetCC and quote reference CAD1536/16Jul.
You can also provide information anonymously to the independent charity Crimestoppers on 0800 555 111.
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