A Police investigation is underway following a mass brawl in Auckland's Karangahape Road, which left three in hospital

The fight involved more than 50 people, and included three serious assaults.

A 21-year-old has been charged with intent to cause grievous bodily harm, but others remain at large.

Detective Senior Sergeant Mark Greaves says they're after any footage or witnesses of the incident, to identify the offenders.