Managers at Plymouth's Derriford Hospital have been ordered to make urgent improvements to protect patients.
It follows an unannounced inspection which found that surgical staff were under such pressure that patient safety was at risk.
It's the second time in recent years that the Care Quality Commission has taken action against the hospital trust.
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Residents living within 100m of Reeco Fernandez's property were advised to leave their homes and had to stay away for four days.
A hospital in South Devon was put on major alert this evening. Police were called to the site in response to "a threat".