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.
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Mainly dry with lengthy clear spells overnight and just a few showers likely, especially in the north and west.
Ysgol Uwchradd Caergybi became the UK's first comprehensive 65 years ago. Academies are now dominant in England, but certainly not in Wales.
Dry for most, but a few showers likely.