Police have recovered a car similar to the one Armagh man Gareth O'Connor was using when he went missing in May 2003.
The discovery was made in the course of a major security operation on the outskirts of Newry in Co Down.
The 24-year-old went missing on the morning of May 11, 2003 while driving from his home in South Armagh to Dundalk Garda Station to fulfil the terms of his bail after he had been charged with membership of the Real IRA.
He had been driving a metallic blue Volkswagen Golf.
His family believed that he had been abducted by the IRA after a dispute over an investment scam – the PSNI had warned him just three days before his disappearance that he was in danger from the IRA.
The PSNI said today’s search was part of an investigation into serious crime.
The operation has been going on for most of the day and members of the PSNI's Underwater Search Unit were called in to examine the murky waters of the Newry Canal.
Heavy lifting equipment was also used, and the road between Newry and Omeath was closed as far as the border.