The hospital in Co Antrim, which treats people with severe learning difficulties and mental health issues, is at the centre of what has been described as the UK's largest police investigation into the alleged abuse of vulnerable adults.
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image captionThe hospital provides treatment for people with severe learning disabilities and mental health needs
A 58-year-old woman arrested by detectives investigating allegations of ill-treatment of patients at Muckamore Abbey Hospital has been released.
The woman was detained on Thursday by detectives from the police s public protection branch.
She is the 19th person to be arrested in the investigation into the County Antrim hospital, which began in 2017.
She has been released pending a report to the Public Prosecution Service (PPS), police said.
Last month it was announced that seven people would be prosecuted for a range of offences.