A teenage boy shot dead a teacher who tried to stop him playing with a gun then killed himself at a school in Nevada on Monday.
Two other boys were in a critical condition with bullet wounds after the shooting at Sparks Middle School, in a small town near Reno in the west of the state. Kyle Nucum, 13, said he saw a fellow student, believed to be 13 or 14, shoot his teacher.
Kyle described to the Reno Gazette-Journal how the teacher saw the boy playing with the gun near a basketball court at about 7.15am shortly after children arrived. He said the teacher ran towards the boy to tell him to put down the gun, but was then shot.
Police said the boy was believed to have killed himself. There were no other suspects, officials said. One wounded boy underwent emergency surgery while the other was said to be "doing well".
Tom Robinson, Reno's deputy police chief, reassured parents that the danger was over. Parents had earlier been told to go to a nearby high school car park to wait for their children.
The scene recalled the massacre at Sandy Hook elementary school in Connecticut last December, when a gunman killed 26 pupils and teachers.