Letby was jailed after being found guilty of murdering seven newborns and attempting to murder eight more between June 2015 and June 2016 while working in the neonatal unit of the Countess of Chester Hospital (CoCH) in northern England, making her Britain’s worst serial child killer of modern times.

Following her conviction, police began to investigate possible corporate manslaughter offences at the hospital, an inquiry that was later widened to consider if individuals might be guilty of gross negligence manslaughter.

“As part of our ongoing enquiries, on Monday, June 30, three individuals who were part of the senior leadership team at the CoCH in 2015-2016, were arrested on suspicion of gross negligence manslaughter,” detective superintendent Paul Hughes of Cheshire Police said.

The three unnamed figures were released on police bail pending further inquiries.