A blaze has broken out on the mountain overlooking Treorchy. Fire services are at the scene, reports Rob Osborne.
Earlier today, firefighters tackled a fire across eight hectares on the Bryn Arw mountain near Abergavenny.
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.