Police are continuing a manhunt, after a fatal street fight in central Hamilton

Four people were injured in an altercation near the city's main entertainment precinct early yesterday morning, hours after the sold-out All Blacks game at Waikato Stadium.

A 20-year-old man died from his injuries in hospital.

Dayne Lennan told Three News he saw a bunch of fights breaking out shortly after midnight, which spilled out onto Alexandra Street.

He says it was a "really intense" altercation, which was unusual for Hamilton.