The military barracks used to house asylum seekers were "run-down", "decrepit" and "filthy" in parts, inspectors have found.
An official report has stated that there were "fundamental failures" over the decision to accommodate refugees in the facilities.
The findings, published on Monday, follow inspections by the Independent Chief Inspector of Borders and Immigration (ICIBI) and Her Majesty's Inspectorate of Prisons (HMIP).
The Home Office has faced repeated criticism over its use of Napier Barracks in Folkestone, Kent and Penally Camp in Wales to house asylum seekers.
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