Greater Manchester Police (GMP) said officers were forced to call for significant back-up as they dealt with large gatherings for the second night running.
The disorder on Saturday night in the Gorton area of Manchester followed large gatherings in the Wilmslow Road area of the city on Friday.
GMP's Deputy Chief Constable Ian Pilling said objects were thrown at officers as they attempted to intervene to stop a party in Harlow Drive, Gorton.
Mr Pilling said: "Despite having significant number of GMP officers on duty, supported by officers from North Wales and Cheshire, we were extremely stretched again yesterday with unprecedented demand."The last thing we need is large gatherings such as this, as well as unacceptable attacks on officers.
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