One person was shot dead and four students wounded by a student who also died at a school in the US state of Washington, police have said.
The shooting reportedly took place in a lunch room at Marysville-Pilchuck High School, near Seattle.
The four students were shot in the head, with three in a critical condition undergoing surgery, the BBC reported.
Officials said the unnamed gunman, described as a male student, died at the scene.
"We are confident that there was only one shooter and the shooter is deceased," Marysville police commander Robb Lamoureux told reporters.
"We are confirming two deceased at this time. One is the shooter and the second deceased, we're not confirming at this time whether it's student or staff."
The four wounded students - two girls and two boys - were taken to Providence Everett Medical Center in the town located about 16 kilometres north of Seattle.
Officials said three victims were in critical condition with head wounds, while a boy with a less-severe injury to the jaw was transferred to Harbourview Medical Center in Seattle.
Television images showed students evacuating the school with their hands over their heads while officers from several local police agencies searched and cleared the school campus.
Officials asked parents to stay away from the area, instead arranging a designated area for them to meet with their children.