Multiple emergency services are attending a major incident in the Mournes involving up to 70 young people.
At least 17 vehicles of multi-agency services are in attendance including three Coastguard Rescue Helicopters, three Coastguard Rescue Teams, Mountain Rescue, Police and Ambulance.
The Coastguard said between 17 and 20 young people were suffering serious hypothermia and lower leg injuries.
The children are being treated for a number of problems but mostly exposure.
The Northern Ireland Ambulance Service said a number of patients will be taken to hospital.
SDLP MLA Colin McGrath said they had been experiencing “woeful weather” and that there was a “substantial emergency vehicle response”.
He said: “Such an incident will surely highlight the need for extreme caution when walking in the mountains especially on days such as today when weather conditions have been atrocious on street/town level never mind up in the mountains.
“I wish all involved a safe resolution to the incident and hope that no one is seriously injured as a result.”
Belfast Telegraph Digital