The PSNI are investigating a potential dissident republican plot to blow up a lorry due to cross the Irish Sea on Brexit day.
Officers are investigating a link to a ferry crossing to Scotland on 31st January and a bomb found on a heavy goods vehicle in Co Armagh earlier this week.
Police received a report that an explosive device was on a lorry in Belfast docks last Friday, the day the UK left the EU.
The report received by police claimed the ferry was due to travel to Scotland. An intensive search was carried out, but nothing was found and the ferry sailed as planned.
On Monday, officers received a further report that a device was attached to a lorry belonging to a named haulage company.
After a two-day operation, which involved the search of 400 vehicles, an explosive device was found attached to a heavy goods vehicle in the Silverwood Industrial Estate in Lurgan, Co Armagh.