HARARE, Zimbabwe (AP) — Zimbabwe’s official election body said Wednesday it will not back down on its ban preventing a leading human rights group from monitoring a referendum Saturday on a new constitution.

Zimbabwe Human Rights Association is facing charges related to alleged electoral offenses and will not be cleared to observe the referendum, said the election commission’s acting head Joyce Kazembe. Officials with the group, also known as ZimRights, have been accused of the illegal possession of voter registration forms and fraud in obtaining them. The group denies any wrongdoing.