A horrifying discovery in an apartment in Kypseli, Athens, has turned into a murder investigation after forensic experts found that a baby whose body was discovered frozen had suffered multiple stab wounds.

She confessed to the Homicide Department, according to information, to the murders for which Irene Mourtzoukou is accused.

Police have arrested a 25-year-old woman in western Greece, charging her with the serial homicide of three infants—including her own two children—and the attempted murder of the child of an adult friend, authorities said Tuesday.