Police remained at Vava'u Lahi Night Club in Cavendish Drive on Sunday morning.

A man is seriously injured after being shot at a south Auckland nightclub in the early hours of Sunday morning.

A witness called police to report fighting and a firearm at Vava'u Lahi Night Club in Manukau's Cavendish Dr at 2.30am.

Police arrived to find a man had been shot in the leg.

He was taken by ambulance to hospital in a serious condition.

No arrests had been made and the police investigation was ongoing, a spokeswoman said.

Vava'u Lahi Night Club is a Tongan nightclub that was previously known as Waterfall.

Director Seini Vasitai Tonga said it was the first time a shooting had taken place at the club.

She said brawls had broken out in the past, but nothing as dangerous as people being shot.

Tonga was not at the club during the incident.

When she drove past on Sunday morning, one of the building walls, which was made of glass, was completely shattered, she said.

Anyone with information about the shooting was asked to call Counties Manukau police on (09) 261 1300 or Crimestoppers anonymously on 0800 555 111.