Previously reported seven injured police officers.
Law enforcement officers left the site after residents complained about a large crowd of people, noise, antisocial behavior and clashes in the Hammersmith and Fulham areas.
Those present greeted the police with hostility; the crowd threw bricks and other objects at the police.
According to a police statement, 11 policemen were injured during the dispersal of an illegal party. Although no one was seriously injured, two police officers had broken bones.
An investigation was launched into the incident. At the moment, the police have not detained anyone.