It is unclear how the gun went off, but luckily, the bullet missed all 20 students in the classroom and only hit a wall.

Parents rushed to the school not knowing the extent of the situation after they were told, “A serious incident occurred in a University Meadows classroom this afternoon.”

The gun was a .22-caliber handgun "small enough to fit in the palm of your hand," said Sgt. David Schwob.

Police are investigating the boy's father who came to the school in the afternoon. Schwob said investigators were interviewing the boy, his parents and other students in the class.