Cannabis worth £2.1m was seized by police from a car that was boarding a Belfast-bound ferry.
A man has been arrested in connection with the incident in Dumfries and Galloway.
Officers recovered the drugs at Lochryan Port, Belfast Way, in Cairnryan, on Tuesday.
The class-B drugs were seized from a vehicle which was about to get on the ferry to Northern Ireland.
According to police, the cannabis has a potential street value in Northern Ireland of approximately £2.1m.
A Dumfries and Galloway Constabulary spokesman said a 60-year-old man from the Manchester area has been arrested.
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