Firefighters across Wales are launching "Project Wildfire" to help tackle deliberate grass and mountain fires.
Firefighters were called to a street in Swansea yesterday after a grass fire spread across two properties.
There was a rise in grass fires this weekend as temperatures increased across Wales.
Fires services in North Wales say they've dealt with grass fires over the weekend.
North Wales Fire and Rescue Services have been called to seven fires since midnight on Friday.
They say some wet weather in the north has meant the fires have had less of an impact.
Fire crews around Wales have been battling dozens of grass fires over the weekend - many of which they say were started deliberately.
South Wales Fire and Rescue Service says it responded to 32 grass fires yesterday, and many more deliberate blazes overnight.
#SWControl have mobilised 47 blue light responses overnight mostly to deliberate grass fires across our brigade area - JM
@swfireandrescue crews responded to 32 grass fires yesterday and 40 deliberate fires in total. Here's some of the areas affected ....
Mid and West Wales Fire Service says four hectares - nearly 10 acres - of grassland was destroyed by a fire above Seven Sisters last night.
It responded to a number of other blazes, as the hot weather continues.
#SWControl Further info on the Rhigos Mountain fire - 4 hectares of grass well alight. Helicopter now assisting us. HB
Crews are in attendance at a large grass fire on the Rhigos Mountain. Six fire appliances are currently dealing with it. #SWControl CP
Grass fires in Merthyr, Aberdare, Abercynon and Tonypandy, if you have any info on these fires contact Fire crime on 0800 731 7287 #FCU
North Wales Fire and Rescue Service are warning people to take extra care when in the countryside after a large gorse fire was found to be caused accidentally by campers.
Around 35 firefighters spent almost 12 hours tackling the 70 acre fire in the Cae Dafydd area of Nantmor in Gwynedd.
– Gwyn Roberts, North Wales Fire and Rescue Service
Every year, outdoor fires destroy acres of countryside and wildlife habitats, and tie up valuable resources which could be saving lives elsewhere. Vegitation is extremely dry at the moment and outdoor fires can spread quickly. Campers and walkers should avoid the use of naked flames and camp in designated areas.
Firefighters are dealing with a gorse fire near Caernarfon. North Wales Fire and Rescue were called to the blaze at 2pm on Saturday afternoon. Four fire engines and an off-road vehicle are dealing with the fire, which covers around a quarter of a square mile.
North Wales Fire and Rescue Service have been dealing with two large grass fires overnight. Crews spent much of the night tackling a blaze near Llangollen, Denbighshire, that spread across one hectare of land. It was brought under control at around five o'clock this morning.
Four pumps and three off road vehicles were used during the peak of the fire. Fire-fighters will return later this morning to reinspect the area.
In Llanuwchllyn near Bala, Gwynedd, a fire swept across 40 hectares last night. Three fire engines and an off road vehicle spent more than five hours dealing with the gorse fire.
South Wales Fire and Rescue say there were also a number of grass fires around Merthyr and Blaenavon.