A 27-year-old man from Merthyr Tydfil has been arrested in connection with a fire at the historic Aberfan chapel.
Fire crews were called to the building in the early hours of Saturday morning where investigations found that the fire was started deliberately.
The fire was extinguished by South wales Fire and Rescue Services but much of the building was destroyed.
Anyone with any information concerning the incident is urged to contact South Wales Police on 101 or call Crimestoppers anonymously on 0800 555 111.
More top news
Ministers say the new system lets doctors and nurses who are self-isolating, but are also willing and able, to continue to work.
A dry but cloudy start to the day with showers in the north later.
Missed Wednesday's Wales at Six? Catch up here.