A 22-year-old man was taken to hospital after a suspected chemical attack at Winter Wonderland.
Met Police officers were called to reports of an altercation between two groups at the Hyde Park event at roughly 8pm on Sunday (December 15).
It was alleged that a bottle containing an alkaline liquid was thrown.
A man was found having been splashed by the liquid and was taken to hospital for treatment.
His injuries were assessed as non-life changing and no other injuries were reported.
Two men, 21 and 18, and a 16-year-old boy, were arrested on suspicion of causing grievous bodily harm.
The 16-year-old has been released on bail. The two men remain in custody.
A spokesperson for Metropolitan Police said: "Police responded to a report of an altercation involving two groups at Winter Wonderland at approximately 8pm on Sunday, 15 December.
"It was alleged that a bottle containing an alkaline liquid was thrown.
"A 22-year-old man who was splashed by the liquid was taken to hospital where his injuries were assessed as non-life changing.
"No other injuries were reported.
"An investigation was launched and three people – two men, aged 21 and 18, and a 16-year-old boy, were arrested on suspicion of causing grievous bodily harm.
"The 16-year-old has been bailed to return to a police station on a date in February. The two men remain in custody.
"Anyone with information about this incident is asked to call the police on 101 giving the reference 5850/15DEC.
"Alternatively, information can be provided to the independent charity Crimestoppers, anonymously, on 0800 555 111."
