Mid and West Wales Fire Service told ITV News they have left the scene of Thursday's crash, although the dual carriageway remains closed between between Aberdulais and Resolven.
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The RSPCA says poison used to control vermin are having an 'unintended impact' on wild animals.
The Grade I listed Old College first opened its doors to students in 1872.
Wet and breezy for a time today, brighter this afternoon