Two men who spent more than 24 hours on a roof in Wrexham town centre have now come down after negotiations with specialist police officers.
The men, aged 18 and 19, have been arrested on suspicion of a number of offences, including public order, and taken into custody at Wrexham police station.
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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).