An officer has been injured, a police car damaged and four teenagers stabbed in two separate brawls on the Central Coast.
Police were called to a community hall at Gwandalan and were confronted by about 100 drunken teenagers, most of whom were underage.
Bottles and rocks were thrown at officers and one suffered a scratched cornea after being hit by shards of glass.
Just hours later, three teenagers were taken to hospital with stab wounds, after a brawl at Killarney Vale.
Police are continuing to question witnesses and victims.
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