Antrim Area Hospital's Emergency Department was forced to tell people to "not attend under any circumstances" after reaching "full capacity" on Saturday.
The Northern Health and Social Care Trust issued a statement on Saturday saying that the emergency department at the hospital was under extreme pressure and that people should only attend if their condition is life threatening.
Shortly after midnight on Sunday, the Trust issued another statement saying that people should not attend the hospital under any circumstance as it had reached full capacity.
