Police have released images of machete-wielding people wanted in connection with a mass fight in Hyde Park that saw a teenager stabbed.
Police were called to the busy central London park at 9pm on Tuesday following reports of an assault and numerous males brandishing machetes.
A 17-year-old boy was found with stab wounds and taken to hospital, where he is said to be in a stable, non-life-threatening condition.
Another 17-year-old boy was arrested on suspicion of affray but the Metropolitan Police is appealing for witnesses to identify others pictured at the scene.
Detective Superintendent Alex Bingley said the "brazen violence that was witnessed by many people enjoying the sun in Hyde Park was both shocking and unacceptable".
"We appreciate the images and videos that were widely shared following the incident will have caused concern to people in the area and to those who visit the park regularly," Det Supt Bingley said.
"I want to reassure the public that we are committed to ensuring our parks remain a safe space for everyone to enjoy.
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"We are doing all we can to track down the individuals involved and bring them to justice.
"Visitors to the park will see an increased police presence and if they have concerns I would encourage them to speak to officers."
Information can be provided to the police by calling 101, or to Crimestoppers, anonymously, by calling 0800 555 111 and providing the reference CAD7861/01JUN.