One man has been seriously hurt and a second is critical following a fight in the Papakura suburb of Rosehill early this morning.
A police spokeswoman said an investigation was underway after two people were "seriously assaulted".
"Police were initially called to an altercation between a group of people on Orchard Rise in Rosehill just before 2am," she said.
Orchard Rise remained closed while the scene was being examined.