Fire services are at the scene of a wildfire on Slievenamon in Co Tipperary.
A unit from Clonmel attended the area on the Ballypatrick side of the mountain shortly after 8.30am.
Another unit from Carrick-on-Suir is also assisting in the operation and fire services are seeking air support to help in the operation.
Plumes of smoke can be seen around the area.
Tipperary Fire and Rescue Service said in a statement that the operation is ongoing and crews are continuing to work at the scene in challenging terrain conditions.
Watch: Plumes of smoke seen rising from scene of Slievenamon wildfire
It added the priority of the emergency response is to contain and extinguish the fire, protect public safety and assess any potential risk to surrounding lands and property.
Aerial support has been requested to assist in establishing the full extent of the fire and to assess any potential impact on adjoining forestry lands.
Tipperary Fire and Rescue Service said it is “premature to comment on the cause of the fire, the extent of any damage, or the full scale of the response operation”.
“These matters will be assessed as the situation develops and verified information becomes available,” the statement added.
It has also advised anyone in the vicinity to avoid the immediate area where possible and to follow any directions issued by emergency services personnel.
Tipperary Fire and Rescue Service said it wanted to take the opportunity to remind landowners, visitors and members of the public to exercise extreme caution during the current period of warm and dry weather.
“The public is urged not to light fires or barbecues in or near forests, grasslands or upland areas and to report any signs of fire immediately to the emergency services” the statement said.
A number of wildfires have broken out across the country in the last week, during the dry weather spell.
Fire services have spent days battling a blaze at Killarney National Park which was reported last Tuesday.
Another fire was reported near Milltownpass in Co Westmeath causing the closure of a section of the M6 motorway for a time.
Coillte urges vigilance as fire brought under control
Semi-state forestry company Coillte said its personnel, along with Tipperary Fire and Rescue Service crews and an Air Corps helicopter, are on site and working to bring the fire under control.
In a statement, Coillte said it is too early to determine the cause of the fire and that its personnel and emergency services will remain on site until the fire is fully contained.
“Coillte would like to remind visitors that a Status Orange High Forest Fire Risk Warning is in place nationally until 12pm on Friday, 24 July.”
It also asked the public to remain vigilant in areas with open public access and where high-risk activities may take place.
“Particular care should be taken on all peatland types. Landowners and land managers are advised to remain alert to any fire activity and to report suspicious incidents to An Garda Síochána.
“Members of the public and visitors to our forests and other recreational areas should cooperate with all requests regarding fire safety, obey all relevant bye-laws and should not use barbeques or other outdoor fire sources in forest lands during the duration of this warning,” the statement said.
It added: “Visitors to the countryside should be considerate in parking vehicles so as not to impede access by emergency vehicles.”
Coillte also asked the public to refrain from lighting fires in and around forests or open land, not to intervene or fight fires under any circumstances, move to a safe location upwind of the fire, call emergency services and obey instructions from emergency services.