Mid & West Wales Fire Service told ITV News that firefighters will remain at the National Library of Wales throughout the day, as investigations continue into the fire that damaged the building's roof on Friday.
More top news
One-year-old sheepdog Nell was stolen from a farm on the outskirts of Dolgellau.
Police are investigating an allegation that a young child was approached by a stranger in Llanelli.
An unsettled few days are in store, with rain and wind expected.