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Gardaí and emergency services boarded the ship when it docked in Rosslare Harbour
Gardaí (Irish police) are continuing to question a man in connection with the death of a woman on board a ferry sailing from Wales to Ireland.
The incident occurred on Tuesday afternoon, on the 14:00 GMT Stena Line sailing from Fishguard to Rosslare in County Wexford.
Gardaí and emergency services attended the scene after being alerted to what police described as "an unexplained death" shortly after 17:00 local time. They then boarded the ship, which is currently docked at Rosslare Harbour.
The woman was later pronounced dead. Gardaí are currently awaiting the results of a post-mortem.
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The ferry docked at Rosslare in County Wexford after travelling from Fishguard in Wales
Irish broadcaster RTÉ reported that the ship's captain made an emergency call about half an hour before the ship docked.
On Tuesday evening, the 19:00 outbound Stena sailing from Rosslare to Fishguard was cancelled with passengers being accommodated by Irish ferries on the 20:45 sailing from Rosslare to Pembroke, according to the company.