Some 75 firefighters have been tackling a major wildfire in the Mourne Mountains in Co Down.
The blaze, in the Bloody Bridge area, which raged across a 3.2km front, is described as being dealt with while the cause remained under investigation.
However, firefighters are tackling another outbreak close to Bloody Bridge in the Slieve Bearnagh area, with three appliances at the scene and operations expected to continue for some time.
The blazes come after a major incident was declared at the weekend when a large wildfire close to the Mourne Mountains led to homes being evacuated. It is being treated as arson.
Firefighters have tackled almost 150 fires in the area since Thursday night.
An amber wildfire warning is expected to remain in place until the end of the week, with the forecast for increasing temperatures in Northern Ireland heightening concerns of further outbreaks.
Police have been using air support and other specialist units to survey the area for potential suspects, to spot fires early, and alert those who may be at risk.
First Minister Michelle O'Neill described the destruction and "devastating" and said there is "no option" but for ministers to work to prevent wildfires.
"Something more must be done, whenever we look at what has happened over recent days, it is absolutely devastating to see these fires rage right across the Mournes.
"There is no option for ministers to do anything other than action, and I think what has been called for in terms of plans are a necessity, and I’ll work with the ministers responsible.
"But it’s a time for everybody to put their heads together to ensure that this doesn’t happen and where it can be prevented we need to do everything we can to ensure it is prevented."
Ms O’Neill added that she had been due to go hiking in the Mourne Mountains with conservationist group the Hiking Hens at the weekend.
"It’s such a beautiful area, something that we very much value and cherish. That’s all in jeopardy because of what we see unfolding."
A Northern Ireland Fire and Rescue Service (NIFRS) spokesperson said that members also tackled wildfires in other areas today.
"In Western Area Command, firefighters were called to gorse on fire in the White Bridge area of Ballygawley, Co Tyrone at 1.57pm," they said.
"There are currently four fire appliances and over 20 firefighters battling a 1.6km firefront.
"Whilst firefighters have been in attendance at these wildfire incidents, NIFRS continues to respond to other emergencies in the community including a house fire in Newry and a fire in a flat in Belfast.
"Firefighters were also called to a potential aircraft incident in Enniskillen earlier today. However, no action was required on arrival.
"A yellow warning for wildfires is in place. Please follow our fire safety advice and stay area from these areas. If you see a fire please call 999 immediately."
PSNI District Commander for Newry, Mourne and Down, Superintendent Norman Haslett, said that wildfires pose a real threat to the homes, farms and lives of the people in the areas affected, as well as to the environment and wildlife.
He said officers believe some of the blazes were started deliberately.
"We have implemented dedicated patrolling and are utilising all the capabilities of our air support and other specialist units to survey the Mournes to help us locate potential suspects, spot any fires early, and alert those who may be at risk or in any imminent danger.
"We are liaising with our colleagues in the Northern Ireland Fire and Rescue Service to try to determine which fires have been maliciously started and people who are found to have deliberately set any of these fires should be under no illusion that they will face legal consequences for their reckless actions."
