Police are continuing to investigate the death of a man in Co Tyrone at the weekend.
It came after what police described as an “incident involving a man armed with a machete” in Omagh on Sunday night.
A man aged 53 died later. It is not believed he died as a result of a machete attack.
A postmortem examination is set to take place on Tuesday to determine the cause of his death.
Aoife was diagnosed with HIV in Australia in 2020: ‘He was unknowingly positive. We had no idea’
Ministers, super juniors and chief whips - what jobs are filled in the cabinet?
Silent Witness review: Cosy crime drama delivers plenty of killer blows
Caroline Darian, daughter of Gisèle Pelicot: ‘It’s difficult to be the daughter of a sexual criminal and the daughter of an icon like my mum’
Detective Chief Inspector John Caldwell said a 20-year-old man was arrested on suspicion of murder.
“We received a report at around 11.55pm about an incident involving a man armed with a machete outside a house in the Slievecoole Park area of the town,” he said.
“Officers attended, along with colleagues from the Northern Ireland Ambulance Service. Sadly, one of the men, aged 53, who had been administering first aid, died a short time later. Another man was taken to hospital for treatment of injuries to his hand.
“A 20-year-old man has been arrested on suspicion of murder and attempted murder, and is currently in police custody.”
Mr Caldwell urged anyone who was in the Slievecoole Park area or licensed premises in the Gortin Road area on Sunday evening, before or around the time the assault was reported, and who saw what happened to get in touch. -PA