An eighth man has been arrested by police investigating last December's £26.5m Northern Bank robbery.
Millions were taken from the vaults of the Northern Bank last December
The 40-year-old was arrested in Londonderry on Tuesday. Four men are now being questioned about the robbery, while two were released without charge.
A 39-year-old man was arrested in Belfast on Monday night in connection with the robbery.
The latest arrest came as a second man appeared in court charged in connection with the raid on Monday.
Martin McAliskey, 42, of Ballybeg Road, Coalisland, denied giving false police statements. He was granted bail.
The charge concerns the alleged purchase, possession and sale of a Ford Transit van believed to have been used in the raid.
Earlier on Monday, a 22-year-old man was arrested in Kilcoo in County Down in connection with the robbery.
On Friday, a 23-year-old County Down man who appeared in court denied involvement in the robbery. He was remanded in custody.
The robbery happened at the bank's Northern Ireland headquarters at Donegall Square West just before Christmas last year.
Some money seized in County Cork last February was linked to the robbery, but virtually all of the missing millions remain unrecovered.