Three men and a woman have been arrested after a young man was found beaten and naked in a taped-up wheelie bin in Co Antrim.
He suffered cuts and bruising and is stable in hospital following the attack near Sentry Hill in Ballymena.
The alarm was raised after a man out walking his dog discovered the victim.
PSNI detective chief inspector Tracey Mageean said: "A man has sustained injuries which are not believed to be life-threatening and is now in a stable condition in hospital.
"Detectives have launched a full investigation with a definite line of inquiry, as evidenced by our four arrests," the senior officer added.
"At this time, I do not believe that there is a sectarian motive nor do I consider that it is paramilitary related.
"This incident has shocked local people as this is an area where crime isn't prevalent," he added.
Police said the investigation is at a very early stage but appealed for anybody with information to contact them.
SDLP Councillor Declan O'Loan said the man was found yesterday in a council-owned park near an old-fashioned sports hall.
"While the full facts are not clear this was obviously a very serious incident and the young person concerned was treated in a disgraceful and degrading fashion," he said.
"There would have been a number of people involved in such an incident and it is likely quite a number of people have useful information in relation to what happened and I would encourage them to go to the police."