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The Welsh government said the work would reduce journey times to ports such as Milford Haven, Wales' busiest for freight which handles about 40 million tonnes per year, as well as Fishguard and Pembroke Dock.

The incident occurred on Tuesday afternoon, on the 14:00 GMT Stena Line sailing from Fishguard to Rosslare in County Wexford.

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.

"In order to assist with the Garda investigation, last night's 19:30 and 01:30 Stena Nordica sailings were cancelled. Today's 08:30 sailing from Rosslare and return from Fishguard at 14:00 have also been cancelled. At this time, Stena Nordica's next expected departure will be at 19:30 from Rosslare."

All ferry sailings between Holyhead and Dublin and Fishguard and Rosslare are currently cancelled.