A person is in critical condition and two others are also in hospital after a mass brawl involving up to 30 young people in Otahuhu last night.

Police have been at the scene today, investigating the brawl and collecting evidence.

A large rock was found on the road behind a silver car, which had its windows down and a smashed windscreen.

A second car with a smashed, caved in windscreen was also found at the scene.

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Police said weapons were used in the fight, which broke out on Mangere Rd, Otahuhu, about 10:20pm.

Three people were admitted to Middlemore Hospital. One has been transferred to Auckland Hospital in a critical condition.

A staff member at nearby Otahuhu College said a portion of Mangere Rd near Great South Rd was cordoned off this morning.

A police spokesperson said a section of the footpath is cordoned off at the top of Mangere Rd, near Piki Thompson Way.

Piki Thompson Way is closed to pedestrians and cars.

Policeare at the scene today, collecting evidence.

A large rock was found on the road behind a silver car, which had its windows wound down and a smashed windscreen.

A second car with a smashed, caved in windscreen was also at the scene.

Police are appealing for information.