Four men have been arrested by police investigating a bank robbery and abduction in Strabane, County Tyrone, last month.
A number of people were taken hostage and held overnight on 8 July.
In the morning one of the people, a bank employee, was sent into the Ulster Bank on Abercorn Square to get money for the kidnappers.
The men were detained on Tuesday morning when police searched houses in Strabane and Sion Mills. A number of items were taken away for forensic examination.