Two 15-year-old girls fatally shoot each other in Phoenix-area school

Two 15-year-old girls died Friday in a shooting at a suburban Phoenix high school that initially caused panic among
parents who could not reach their children but later emerged as a murder-suicide.

However, officers did not reveal any details of what the note said, and did not discuss what they believe the motivation for the killings may have been. 

Officers also refused to name the pair, though school teacher Phong Kieu earlier named one of the victims as her sister, May Kieu.