A young mother has been accused of mercilessly killing her newborn son by throwing the infant from the second floor of a building in Japan on Tuesday, Dec. 14.

Twenty-three-year-old Chihiro Saito, a part-time employee, has been arrested on suspicion of murder after she allegedly threw her newborn baby from the second floor of a two-story building located in Yotsukaido, Chiba Prefecture, Japan on Tuesday, Dec. 14, Japan Today reported.

The mother's motive behind the cruel murder remains unclear.

Officers responded to the scene after the staff at a group home for children alerted them that a naked baby’s body had been found behind the two-story building. The authorities immediately transported the baby to a nearby hospital for treatment, however, the baby infant was pronounced dead upon arrival at the facility.

In a similar but unrelated incident, a Brooklyn mother was arrested and charged with attempted murder after she allegedly threw her two young children out the second-floor window of an apartment building in June. 12 earlier this year, NBC New York reported.

On Saturday, June. 12, the mother, Dejhanny Jarrell, 24, allegedly threw her 1-month-old baby and her 2-year-old son out of the window of the Brownsville building. After throwing her children out of the window, the woman jumped after them herself.

The children and the mother were immediately rushed to Brookdale Hospital for treatment. The infant was reportedly admitted in a critical condition. However, the injuries of the mother and the 2-year-old son were believed to be non-life-threatening.

In another incident, an Indian father has been accused of mercilessly throwing his two-month-old infant into a lake, claiming that the baby did not resemble anyone in his family and speculating that child was his wife's offspring with another man, Latin Times reported. 

The incident happened at Kalyandurg in the Anantapur district of Andhra Pradesh, India on Oct. 21. The accused, identified as Mallikarjuna, a former insurance agent, reportedly took his wife Chittemma and their two-month-old daughter to a hospital for a medical check-up on Oct. 21.

However, when the baby started crying while they were waiting for the doctor's appointment, Mallikarjuna took off with the infant, telling his wife that he was taking her outdoors to pacify her. He then allegedly taped the newborn girl's mouth, put her in a jute bag, and proceeded to throw her into a lake.

Newborn baby A mother reportedly killed her six-month-old infant son by giving him an excess dosage of cough syrup and later dumping his body in a water-filled drum. This is a representational image. Photo by esudroff/Pixabay