Monaghan Co Council has launched an investigation into suspected electoral fraud related to the recent local elections.
The move follows revelations that seven immigrants were registered to vote at an empty house in Ballybay which had not been occupied for almost three years.
Their names were added to the supplementary voting list just days before the deadline expired.
However, the local authority says it did not have the resources to check the hundreds of names added to the list at that late stage.