(FOX/AP) --Police say the 12-year-old student who opened fire on a Sparks middle school campus, got the weapon from his home.
The boy wounded two classmates and killed a teacher before he turned the gun on himself.
Washoe County School District police say they are still working to determine how the boy obtained the 9mm semi-automatic Ruger handgun used in the Monday morning spree at Sparks Middle School. The boy's parents are cooperating with authorities and police say they could face charges in the case.
Authorities say they're withholding the seventh-grader's name out of respect for his family.
At a news conference Tuesday, law enforcement and school officials again lauded the actions of 45-year-old math teacher and former Marine Michael Landsberry, who tried to stop the rampage before he was killed.
The shooting happened on the school's campus, but outside the school building itself, according to police.
Spokeswoman Angela Rambo of Renown Regional Medical Center says two boys are in critical condition.
Gov. Brian Sandoval issued a statement after hearing about the shooting.
"I was deeply saddened to learn of the horrific shooting at Sparks Middle School this morning. My administration is receiving regular updates and the Nevada Highway Patrol is assisting at the scene," he said. Sandoval extended his thoughts and prayers to those affected.
Sparks, a city of roughly 90,000 that sprung out of the railway industry, lies just east of Reno.