Murder squad detectives have arrested their chief suspect following the fatal stabbing of a Dublin teenager at the weekend.
John Paul McDonagh died after a violent argument between a number of men in Fermanagh on Saturday night.
The 18-year-old, who was from Finglas but had been living in Enniskillen for some time, suffered fatal injuries after being hit with a slash hook.
A 24-year-old man was injured, while a 19-year-old who was with Mr McDonagh was arrested but later released without charge.
A fourth man, who is suspected of killing the teenager, was on the run for a number of days following the incident, but was arrested yesterday by the PSNI.
The 29-year-old suspect is a bare knuckle boxer who lives in the North but also has connections to the Republic.
The PSNI said detectives from its Murder Investigation Team "investigating the murder of 18-year-old John Paul McDonagh in Enniskillen at the weekend have arrested a 29-year-old man on suspicion of offences, including murder, and he remains in custody".
The fight that led to the death of Mr McDonagh in the Coolcullen Meadows area of Enniskillen was captured on video, which showed a number of people armed with weapons, including bottles and a slash hook.
Mr McDonagh was treated at the scene before being rushed to hospital, but he died on Monday morning.
Relatives took to social media to pay tributes to him.
One wrote: "Eighteen years of age, his whole life ahead of him. He didn't deserve this."
Another added: "RIP John. Really can't believe you're gone. You will always be remembered, never forgotten. Fly high."
The PSNI was liaising with gardai to determine if the chief suspect had fled across the border after the killing.
Detective Chief Inspector John Caldwell said the force was appealing for anyone who captured mobile phone footage to get in touch.
"Tragically, the 18-year-old male victim passed away in hospital, and I want to express my condolences to the victim's family, friends and loved ones at this very sad time," he said.
"Our investigation continues, and I am appealing to the public to help us establish exactly what happened and who was involved.
"If you witnessed the altercation, please get in touch with us."