Man shot dead by police after killing sisters

A US man fatally stabbed his 17-year-old sister, decapitated his five-year-old sister in front of a police officer and then turned toward his nine-year-old sister with a knife in his hand before officers shot him dead in what their chief described as “a killing field”.

There was no clear motive for the events that unfolded in a Boston suburb the day after the five-year-old’s birthday.