ITV News understands that all three of those arrested work at Zoar Residential Care Home.
Care and Social Services Inspectorate Wales (CSSIW) last inspected the home in December last year.
The inspection report states that it focused on 'quality of life' and not on staffing, leadership and management at the home.
The report found that out of three respite records inspected, two had no care plans or risk assessments.
It states: "This meant that staff may not always be aware of people's choices and preferences as to how they would like their care to be delivered, what their preferred routines are or how they like to spend their time.
"Staff only had the social services unified assessment to inform them of people’s care needs. This is unsatisfactory as the assessment does not give details as to how care is to be carried out, only that there are particular needs."
More top news
Rain clipping the far north through the evening but elsewhere staying dry with some sunny spells.
Public Health Wales figures show 25 more cases of the virus have also been confirmed.
Photos taken on Saturday morning show Roald Dahl Plass strewn with empty beer bottles and discarded canisters of laughing gas.