After being questioned by investigators throughout the day, the teen changed his previous story, now saying he killed not only his father but his entire family, ANSA has learned.

The teen early on Sunday morning called the 112-emergency service saying he killed his father after the man had stabbed his mother and 12-year-old brother to death in their home.

He claimed to wake up during the night after hearing his mother and brother scream before entering his sibling’s room to find his dad holding a knife beside their bodies.

The teen said he then took the knife from his father’s hands and killed him.

The murders occurred at around 1 a.m., investigative sources said.

Investigators found discrepancies in the boy’s version of events, noting for example that he did not have signs on his body of a fight with his father.

The 17-year-old was officially placed under investigation on Sunday afternoon by Milan’s juvenile prosecution unit before he confessed to allegedly committing all three murders.

The family of four on Saturday night had celebrated the father’s 51st birthday with relatives at the small villa the family owned in the town near Milan.

The night ended with the murder of the man, his 49-year-old wife and their youngest son, aged 12.

Carabinieri police investigating the triple murder said all four members of the family were at home at the end of celebrations.

Family friends and the mayor of Paderno Dugnano, Anna Varisco, expressed shock at the news.

“They were a normal, serene family, not followed by social services and described by everyone as not having problems,” Varisco told ANSA.

The outcome of investigations by the Carabinieri’s forensic unit, including on the alleged murder weapon and autopsies, will be key in verifying the new version of events, investigative sources said.

ANSA