The three men who allegedly attacked two brothers in Christchurch early Sunday morning have been found.

Police were now speaking to the men about the incident and no charges have been laid yet.

The men, believed to be in their early 20s, allegedly attacked the brothers on St Asaph St, between Colombo and Durham Sts about 1am on Sunday.

Both of the victims were seriously hurt in the assault, and one remains in hospital with a serious head injury, after being king hit by one of the alleged offenders.

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The second man was treated in hospital for facial fractures, but has since been discharged.

The fight was broken up by security guards and the victims' friends.

A police statement earlier said one of the men is believed to be Caucasian, with ginger or brown curly hair, of large build and between 173cm and 180cm tall.

He was wearing a light-coloured button down long sleeve shirt, dark-coloured pants and dark-coloured shoes.

The other two men have been described as Maori. One is said to be of large build, and the other thin build.

They were both wearing dark-coloured clothing.

Police thanked the public for their help to find the men.