A car driver has died after a collision with a bus carrying students from Coleg Sir Gâr in Ammanford in West Wales.
Several students travelling on the bus have been injured. It happened near Junction 49 of the M4 near Pont Abraham.
David Wood reports from the scene.
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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.