A P&O ferry, which operates between Larne and Cairnryan, has now docked safely at Larne harbour after losing power
and live on Freeview channel 276
The European Causeway, which can carry up to 410 passengers, was adrift about five miles off Larne Harbour.
It left Cairnryan at about noon today and was due to arrive at Larne Harbour at 2pm.
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Hide AdIn a series of Tweets, P&O said the incident occurred due to a mechanical issue in the Irish Sea and a full inspection will take place when the ship is back in port.
Tugs from Larne and Belfast had been deployed to guide it back to port, P&O tweeted.
A RNLI lifeboat from Larne and Red Bay were launched to the vessel.
It is understood the Queen Victoria cruise ship, en route to Belfast for a refit, is also on site, along with a coastguard helicopter from Prestwick.
Ship tracking websites showed the vessel’s automatic identification system (AIS) status is set to Not Under Command, according to tracking websites Marine Traffic and My Ship Tracking.