A new suspect is being questioned by murder squad detectives investigating the death of Monaghan teenager Jason McGovern, it was disclosed today.
The 17-year-old suspect is from the Omagh area, where the student was attacked in the early hours of Monday.
Mr McGovern, 19, was punched outside a nightclub after being involved in a verbal exchange with a group of men.
He travelled to Omagh with a group of friends but became separated.
He later made his way to the border village of Emyvale, Co Monaghan, where he had been staying with friends. He was found dead at midday on New Years Eve.
PSNI detectives said the 17-year-old was in custody assisting them with their inquiries.
An 18-year-old man arrested yesterday remains in custody while a man aged 21 who was also held yesterday has been released on police bail.
Omagh's Policing and Community Safety Partnership is meeting today to discuss the death.