A 23-year-old man arrested following an alleged racially aggravated public order offence at the Liberty Stadium has been released on conditional bail.
South Wales Police are continuing to investigate the incident which took place during yesterday's game between Swansea City and Norwich.
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There will be a fresher feel with temperatures falling lower than on recent nights.
The accident between junction 24, Coldra, and 23A, Magor, has closed the eastbound carriageway.
Eloise Parry, 21, died after taking diet pills containing the poisonous Dinitrophenol (DNP).