Officers were injured by bricks and "other missiles" when police were attacked at another violent unlicensed music event at a London estate on Friday night.
Metropolitan Police said officers were called to the illegal event in Hammersmith and Fulham in White City and attempted to disperse the crowd.
"Officers attempted to engage the crowd in order to get them to leave the location but the group became hostile," The Met said.
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"A number of items were thrown at police, who retreated in order to regroup."
Specially trained public order officers entered the estate to disperse the group, but encountered more hostility and violence.
A Dispersal Zone was authorised under the Anti-Social Behaviour Crime and Policing Act.
Police managed to disperse the crowd by about 1.15am.
At least seven officers were injured "as a result of the hostility".
Video has emerged showing officers being chased through the streets by revellers throwing bottles and other objects.
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