Six young people rushed to hospital after out-of-control house party in Brisbane

Six young people, including a 12-year-old were rushed to hospital after an out-of-control house party in Brisbane's south on Friday.

Almost 400 people attended the party, which was for a 17-year-old's birthday, in Chambers Flat about 11pm on Friday.

Paramedics and police were quickly called to the property, when a number of party-goers began passing out.

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One attendee, who wished to remain anonymous, told 9News they quickly left the party when things began to turn.

"It was meant to be a birthday party. It was only meant to be 90 people and then like 400 people came," they said.

Queensland Ambulance Service's Jane James said paramedics had to retreat and wait for police.

"It was a hectic scene," she said.

"A fight actual broke out in front and (paramedics) had to retreat and wait for police to arrive."

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Police were quickly on scene, bringing the crowd under control to ensure ambulances could gain access.

Six patients were taken to hospital, including a person who was allegedly assaulted.

"It's very concerning for a 12-year-old to be at such a large house party and potentially consumed alcohol and maybe drugs as well," James said.

Police issued a 19-year-old man with an infringement notice for trespassing and public nuisance.