Party gatecrashers spark mass brawl

Gatecrashers have sparked a brawl at a birthday party on the NSW Central Coast during which police used capsicum spray and arrested two teenagers.

The violence erupted at a birthday house party in Blue Haven, near Budgewoi on Friday night after more than 30 gatecrashers arrived.

Police said a number of fights broke out and officers used capsicum spray to try and disperse the brawlers.

Three teenagers and a policeman were treated at the scene for minor injuries.

Two teenagers were arrested. A 16-year-old girl was charged with assault and breach of bail.

She was refused bail and was due to appear at a children's court on Saturday.

A 15-year-old boy accused of affray was dealt with under the young offenders act.