Nevada student shoots teacher dead, wounds two before killing self

SPARKS, Nevada (Reuters) - A 12-year-old student armed with a semi-automatic handgun shot and killed a math teacher and critically wounded two classmates before killing himself at his Nevada middle school on Monday, law enforcement officials said.

Witnesses described a chaotic scene at the school in the northwestern Nevada town of Sparks, just east of Reno near the California border, after the gunfire erupted outside classrooms as students were arriving for the school day.