Addressing a news conference said that there is a possibility that the parents could face charges for not preventing the boy from accessing the gun.
The 12-year-old after opening fire turned the gun on himself. According to reports, he had brought the gun from his house and opened fire just before the opening bell on Monday morning.
Tom Miller, deputy police chief for the northern Nevada town of Sparks said that everybody wants to know why. "That's the big question, everybody wants to know why?" he said.
Police: Young boy brought the gun from home
A Math teacher who tried to intervene to stop the shooting was killed in the gunfire . the police have refused to identify the young shooter citing reasons that they were protecting his grieving parents. The police say that he had brought the gun from his home, which could spell trouble for the parents.
The Nevada law bars any person from knowingly permitting a child to handle or possess a firearm, according to the Law Centre to Prevent Gun Violence.