A major rescue operation is underway following reports that the European Causeway is adrift after losing power near Larne.
RNLI lifeboats are at the scene along with Rescue 199 from Prestwick.
The ship was previously detained in Larne by Maritime Coastguard Agency due to safety concerns over crew training and fire safety etc.
The ship's AIS status is set to "Not Under Command."
UPDATE : P&O Ferries statement: “Following a temporary mechanical issue, the European Causeway is now continuing on its scheduled journey to the Port of Larne under its own propulsion, with local tugs on standby, where it will discharge its passengers and cargo as planned."