Seven police officers were hurt after trying to break up an unlicensed music event on Friday night.
Police were called to White City following reports of a number of people gathered on the White City estate.
Bricks and other missiles were thrown at police when they tried to speak to the group, forcing them to back away before more officers arrived.
None of the injuries are said to be in a life-threatening condition.
Mayor of London, Sadiq Khan, said: “It’s disgraceful that police officers came under attack with some suffering injuries at an illegal gathering in White City.
“Violence against the police will not be tolerated and perpetrators will be caught and prosecuted.”
Police were called by residents complaining about a large gathering, noise, anti-social behaviour and violence.
Officers trained to deal with public disorder were met with hostility and violence, police said.
A dispersal zone was authorised in the area while a section 60 order was also imposed.
Deputy Assistant Commissioner Laurence Taylor said: “These gatherings are illegal and also pose a risk to public health.
“The violence shown towards officers this evening was totally unacceptable and we will not tolerate it in any form. Officers encountered bricks and other missiles being thrown at them.”
Police in the capital have been called in to break up several illegal gatherings in the past fortnight, with more than 20 officers hurt at a gathering in Angell Town, Brixton, on June 24.
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