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BBC News Tees
The Care Quality Commission (CQC) found patients at West Lane hospital in Middlesbrough were not safe and at high risk of "avoidable harm".
Inspectors found not all staff had the skills or experience to do their job, and some wards had insufficient staff.
The Tees, Esk and Wear Valleys NHS Trust said it was taking "urgent action" to address the issues raised.
Admissions to the hospital were temporarily suspended following the death of 17-year-old Christie Harnett in June, and on 9 August Nadia Sharif, also 17, died.
Both their families have called for action to be taken to prevent further deaths.
In March it was revealed 13 members of staff were facing disciplinary proceedings over the alleged ill treatment of patients.