Cheshire Police have confirmed they have opened an investigation into a high rate of infant deaths at a local hospital.
The Countess of Chester hospital contacted police after realising 15 babies died and six collapsed in the 2015-2016 administrative year.
It hopes the police can rule out unnatural causes of death over the course of its investigation.
A review of the hospital's neonatal ward in November 2016 by the Royal College of Paediatrics and Child Health (RCPCH) found it was understaffed, and five babies had died in the 2013-2014 year.
But no definitive cause of the rise between 2015 and 2016 was given, despite the review identifiying gaps in rotas and other such issues.
In a statement, the hospital said it was confident the unit was safe to use, while the police has said it will work with the staff to ensure concerns from expectant mothers are met.