Police say a man out socialising last weekend was attacked and is still in hospital today with head injuries.
The man was injured in the New Plymouth CBD early on Sunday morning, police said.
Detective John Simes was looking for witnesses to help find the man's assailant or assailants.
Police were especially interested in sightings from the area around The Mill liquor store on Courtenay St.
Police said people with relevant information should phone Mr Simes of the New Plymouth Criminal Investigation Branch on (06) 759 5500.