A teacher was killed and two students were wounded when a student opened fire at a school in the US state of Nevada.
The student took his own life after the shooting at a middle school in the northern Nevada city of Sparks, law enforcement officials said.
Both of the wounded students from Sparks Middle School were listed in critical condition and one had undergone emergency surgery, Reuters reports.
Law enforcement officials said the student gunman opened fire at 7.16 am on Monday, about 15 minutes before classes were scheduled to begin at the school, which serves seventh and eighth grade students.
Police said students were arriving at that time and congregating to play sports or waiting for the first bell to ring.
They said it was too early to tell if the boy, who was not immediately identified by authorities, was targeting anyone in the shooting rampage.
The incident marked the latest in a string of shooting rampages across the United States in recent years, some of them at schools, that have reignited a national debate over gun control.
In Connecticut last December, 20 students and six adults were shot to death by a gunman at a school in Newtown before the attacker took his own life in what is considered one of the worst school shootings in US history.