A grass fire that broke out on Māngere Mountain in Auckland on Saturday night has now been contained by firefighters.

Crews were called to the scene, near Domain Road, just before 9:30pm.

Nineteen crews fought the blaze, with firefighters also standing guard at the entrance to the road and turning away people who were trying to get a closer look at the flames.

The fire grew to more than three hectares, Fire and Emergency said.