Two arrested in criminal probe in County Louth 21 February 2013 Last updated at 11:27 Two men have been arrested in Dundalk, County Louth, as part of an Irish police investigation targeting criminal and subversive activity. The operation was carried out in the early hours of Thursday morning. It is understood it is not directly related to the investigation into the murder of detective garda Adrian Donohoe. He was shot without warning by a gang that robbed a credit union in Bellurgan, near Dundalk, in January. The PSNI said they believed the gang drove to the forest from the direction of Dundalk after the shooting. Searches were conducted at various properties at six locations in Dundalk on Thursday. The two men who were arrested are in their 30s and 70s. They are being detained at Drogheda Garda Station.