Police in the North have arrested a third man in connection with last December's Northern Bank robbery.
The 30-year-old was arrested in Belfast earlier today by detectives hunting those responsible for the £26.5 million raid - the biggest heist in British or Irish history.
Last night two men were arrested in Kilcoo, Co Down as part of the same inquiry. All three have been taken to Antrim police station to be interviewed.
The three men are being held under the Terrorism Act of 2000.
They can be held for up to seven days, but police will need to seek an extension on the detention after 48 hours.
The December 20th robbery at the Northern Bank's headquarters in central Belfast, in which the families of two bank workers were held hostage, severely dented efforts to revive government set up under the Belfast Agreement.
Nobody has yet been charged in connection with the case but PSNI chief constable Hugh Orde has consistently indicated he believes the IRA was behind the raid - a claim which the paramilitary denies.
In a bid to thwart attempts to launder the cash, the Northern Bank withdrew all its paper currency but police said up to £10 million of the haul was untraceable.
Police on both sides of the Border have so far only recovered relatively small amounts of cash believed to be linked to the raid.
Cash seized in Co Cork last February was linked to the raid, but virtually all of the missing millions is unrecovered.
Last March the Northern Bank was forced to replace all its £10, £20, £50 and £100 notes with new notes carrying a different logo.
About £60,000 in used Northern Bank notes recovered in Co Cork last February as part of an investigation into a suspected IRA money-laundering has been linked to December's raid in Belfast.
Sinn Fein Assembly member for South Down, Willie Clarke, hit out at the way the arrests were handled.
"This is just another example of heavy-handed political policing at its worst," he claimed.
"These families are being targeted for no other reason than they have republican sympathies."
PA