LOS ANGELES - A teenager opened fire at a school in the US state of Nevada Monday, killing a teacher and critically wounding two students, police and reports said.
The shooting, which a witness said happened near a basketball court at the Sparks Middle School in Reno, also left the young gunman dead.
"The one deceased is a staff member of the school," Washoe County School District police chief Mike Mieras told reporters, adding: "The other deceased individual at this point in time appears to be a student-slash-suspect in this case."
Authorities have not released details on the shooter's identity, his motive or how he died.
Two students rushed to Renown Regional Hospital were listed in critical condition, said hospital spokeswoman Angela Rambo, cited by NBC News, after the shooting at around 1415 GMT.
Mieras said later that one of the students had undergone surgery, and the other was "doing well."
With details of what happened still emerging, a teenage witness described seeing a fellow student, wearing a school uniform, shoot a teacher in the chest.
"We were by the basketball court, and we heard a loud pop, and everybody was screaming," 13-year-old Kyle Nucum told the Reno Gazette-Journal, saying a teacher went to investigate.
"I thought it was a firecracker at first," Nucum said.
"The student was pointing a gun at the teacher, after the teacher told him to put it down... and then the student fired a shot at the teacher and the teacher fell and everybody ran away."
"We ran across the field to get somewhere safe, and while we were running we heard about four or five more shots," he added.
US Senate Majority Leader Harry Reid, who represents Nevada, sent his condolences to the school community.
"My thoughts are with teachers, parents and students at Sparks Middle School who experienced a traumatic morning," he said on his Twitter feed.
"Nevada mourns with them."