A 16-year-old student has been charged with attempted murder in the shooting of a South Dakota high school principal, who was lightly wounded in the arm.

Lincoln County State's Attorney Tom Wollman says charges were filed Thursday against Mason Buhl as an adult. They are one count each of first-degree attempted murder and commission of a felony while armed with a firearm.

Buhl is accused of shooting Harrisburg High School Principal Kevin Lein during school hours Wednesday. Buhl was subdued by other school officials and no one else was hurt.

Buhl's father, Rodney Buhl, told The Associated Press on Wednesday that he doesn't know what led his son to the shooting. He says the teen has been very quiet over the past year and thinks he's "just mad at everybody."