Three people who were part of the senior leadership team at the hospital where killer nurse Lucy Letby worked have been arrested on suspicion of gross negligence manslaughter.
Cheshire Constabulary said the suspects, who occupied senior positions at the Countess of Chester Hospital between 2015 and 2016, were arrested on Monday.
All three have since been bailed pending further inquiries, the force added.
Letby, 35, from Hereford, is serving 15 whole-life orders after she was convicted of murdering seven infants and attempting to murder seven others, with two attempts on one of her victims, between June 2015 and June 2016.
Police said corporate manslaughter and gross negligence manslaughter probes are continuing.
