Authorities in England arrested a woman on suspicion of killing eight babies and trying to kill six more at a hospital near Liverpool, NBC News reported.
Police only identified the suspect as a "health care professional" in a statement released Tuesday.
The woman's arrest comes amid a yearlong probe into the deaths of 17 babies and 15 "non-fatal collapses" at the neonatal unit of The Countess of Chester Hospital between March 2015 and July 2016.
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"This is an extremely difficult time for all the families and it is important to remember that, at the heart of this, there are a number of bereaved families seeking answers as to what happened to their children,” Detective Inspector Paul Hughes said in the statement.