Boy charged after Sydney party brawl

A 15-year-old boy has been has been charged after two men were stabbed during a brawl outside a party in Sydney's west.

One man has a punctured lung after being stabbed in the back, while another has a non-life threatening wound under his arm, They've been treated in hospital.

Police arrested 12 people, including six boys aged between 15 and 17, when they were called to the party at Quakers Hill at 10.30pm on Saturday.

A 15-year-old boy from Blacktown has now been charged with a number of charges, including wounding with intent to cause serious bodily harm.

He's been refused bail to appear in a children's court later on Sydney.

A 20-year-old man has been charged with breaching bail.

Investigations are continuing.