Police arrested two Jewish revellers as a group of 300 people caused "havoc" during rowdy Purim celebrations.
The men were arrested on suspicion of affray in north west London on Saturday night after residents called for officers to disperse the crowds.
Barnet Police said there had been "fighting, throwing of fireworks and general havoc" in Brent Street, Hendon, and Golders Green Road, Golders Green, between 10pm and 12.30am on Sunday morning.
Officers and Community Security Trust volunteers separated Jewish men who were drunk and fighting with each other. Members of the Orthodox Shomrim volunteers were also in the area during the Purim celebrations.
Those who were arrested were later released without charge.
A police source said: "We thought it was going to be a quiet affair and then a group of young males came out, charging around and drinking. We were not expecting it.
"We always thought Golders Green was a quiet sort of place, but obviously not. We encouraged them to chill out."