By Steve Kingstone
BBC Washington correspondent
A 14-year-old boy has killed his head teacher in a shooting incident at a school in the American state of Pennsylvania, before turning the gun on himself.
Police officers were called to the Red Lion Junior School shortly before the start of lessons following reports of gunfire in the school cafeteria.
Students were traumatised by the attack
They found two victims - the student and the school principal, Dr Eugene Segro.
The principal was taken to hospital, but pronounced dead on arrival.
The police say the boy, who has not been named, had come to school carrying several handguns.
A number of other students were in the cafeteria at the time of the shooting - they are receiving counselling.
At this stage there is no indication of a possible motive.
This is the latest in a string of fatal shootings at American schools.
It comes almost exactly four years after the killings at Columbine High School in Colorado in which 14 students and a teacher died.