MILAN—A 17-year-old high school student, who confessed to stabbing to death his 12-year-old brother and parents, had been suffering a general sense of “malaise,” Italian prosecutors said Monday, adding that he has been unable to provide a motive for a triple homicide that has shocked Italy.
The minor, whose name was being withheld because of his age, was being held on suspicion of murder with aggravating circumstances including premeditation.
