Police have launched an investigation following disorder in Hackney and are appealing for anyone with information to contact them.
Officers were called at approximately 23:40hrs on Saturday, 8 August to reports of a large party at Sandford Court on Bethune Road, N16. When officers arrived, they were confronted by more than 400 people, many of whom were wearing face masks.
Shortly after the officers arrived, they came under a sustained attack with bottles, bricks and other items thrown at them from balconies.
A number of bins were also pushed towards police vehicles.
Police officers from the Met's Territorial Support Group and Dogs Units attended, as did the police helicopter.
Several fights subsequently broke out between those who had attended the party.
The group was dispersed by 02:00hrs on Sunday, 9 August. A search of the area led to the discovery of a knife.
No officers were injured during the disorder; a member of the public was treated by the London Ambulance Service after suffering breathing difficulties.
Detective Chief Inspector Cath Edginton, from Hackney borough, said: "A number of residents had contacted police to complain about the noise levels at the party and it was for this reason that officers attended. To be confronted by hundreds of people and attacked in this way is wholly unacceptable.
"It is fortunate that none of my officers were injured.
"I would also like to take this opportunity to appeal to anyone who witnessed the events or has information about the people responsible to contact the police."
No arrests were made during the disorder but enquiries continue to identify and trace those involved.
Anyone with information is asked to call police on 101 or to remain anonymous, call Crimestoppers on 0800 555 111.