Two police officers sustained injuries after a spontaneous water fight in London's Hyde Park spiralled into chaos. One officer was stabbed while another was hurt by a bottle which had been thrown.
Police were by the Serpentine from 3pm BST on 19 July as people began to gather for a water fight. "At around 20:40, parts of the increasingly large crowd became hostile to police and items – including bottles – were thrown towards officers," a statement issued by the Metropolitan Police said.
The police officers were taken to hospital to receive medical treatment and neither suffered life threatening injuries. Two other people also suffered stab wounds and were taken to hospital. Their condition remains unclear.
No arrests have been made as yet. Officers are dealing with the incident at the scene.
London Ambulance tweeted: "We have a number of resources dealing with an incident at #hydepark."
Some social media users described Hyde Park as a "war zone" while others asked why people would take knives to a water fight.
Any witnesses or anyone with information regarding this incident is asked to call police in Westminster via 101. To give information anonymously contact Crimestoppers on 0800 555 111 or at crimestoppers-uk.org.