Teen killed after 'brutal' bashing in baseball bat fight

An 18-year-old man has been "brutally" killed and two young men are in custody after a brawl erupted at a party in Sydney's southwest.

Police say the fight broke out at a home in Ingleburn just before 9.40pm on Friday before it spilled onto the street.

The crowd grew bigger on Chester Road as more people arrived in vehicles, bringing with them a number of weapons including a baseball bat, golf club and wooden and metal poles.

Police respond to wild brawl in Ingleburn where one man was killed.
An 18-year-old man has been killed and two young men are in custody after a brawl erupted at a house in Ingleburn Friday night. Source: 7NEWS Sydney

"It was a chaotic scene," Detective Chief Inspector Michael Moroney told reporters on Saturday.

Emergency services discovered the teenager on the road with serious head injuries and he was pronounced dead at the scene.

"Obviously this is a very tragic set of circumstances, a young 18-year-old boy who goes out for the evening, and has been killed in such a brutal manner," he said.

Four men, all aged 19, were arrested at the scene and two have been released without charge. The other two remain in custody at Campbelltown Police Station.

Emergency crews responded to Ingleburn brawl Friday night.
Police say the fight broke out just before 9.40pm on Friday before it spilled onto the street. Source: 7NEWS Sydney

Det Chief Insp Moroney said inquiries were continuing into why the fight broke out at the party, which was attended by 50 to 80 people.

Several crime scenes have been established and police have appealed to anyone with information or footage to come forward.

"It's important for the sake of the family that these people come forward," he said.

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