A man has head injuries and may lose his hand and another man has head injuries after a mass brawl on Brisbane's southside.
Police say the fight, involving about 40 men armed with various weapons including bats and poles, erupted on Daw Road, Runcorn, about 10.30pm on Monday.
Officers arriving on the scene found a 36-year-old man with significant hand, neck and head injuries.
Some of the men allegedly involved in the brawl tried to flee in a four-wheel-drive but were stopped by the dog squad on a nearby street.
Seven men, aged between 22 and 38, were arrested while another man was apprehended on a nearby street.
Queensland Ambulance Service medical director Dr Stephen Rashford says three men were rushed to hospital for treatment, including two with serious injuries.
He said the 36-year-old's hand injury was a "limb-threatening wound".
Another male in his 30s suffered head injuries, Dr Rashford said, while a third was treated for minor injuries.
Detectives said all eight men who were arrested have since been released as investigations continue.
Acting Superintendent Simon Tayler said police were aware of some tensions within the community and have previously engaged with members, but the exact motive is under investigation.
"What we do know is that they are two groups that were known to each other, and at this stage, motives, size, reasoning is forming all part of the investigation," he said.
"Preliminary investigations have told us that there has been some social media chat in relation to that.
"That'll form part of the investigation centre's briefings today, to look at all aspects of whether it was organised who organised that, how did they come to meet at that specific spot.
Mr Tayler added that it's understood the brawl was engaged by members of the Indian community, but ethnicity and background doesn't matter with incidents such as these.
"The important thing for us is to take the ethnicity out of it. We just shouldn't see 40 people taking that sort of weaponry out in the street and doing what they've done to each other," he said.
"We don't want that sort of behaviour from any member of the Queensland community. It is unacceptable and the Queensland Police Service takes a very dim view and we'll investigate and prosecute as much as we can."
Witnesses with information about the brawl, or who can identify those involved, are being urged to contact police.