A gas leak outside Phase 1 of the Children's Hospital for Wales in Cardiff has led to two wards being evacuated.
The ground floor of the maternity unit and the antenatal clinic have been evacuated as a precautionary measure, a spokesperson said.
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Cloudy with patchy rain or drizzle, possibly turning heavier for a time.
Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.