From the article:
a man fired a rifle into Willcox High School, leaving a teenage boy wounded as he watched a baseball game, police announced.
Shortly after the incident, Arthur J. Tineo was arrested. The weapon he used was found about a block away from the scene of the shooting, according to Willcox Dept. of Public Safety Chief Jake Weaver.
A motive for the incident remains unknown.
The Huffington Post reports the incident was reported by someone who called 911 about a man in a field across from the high school. The entire area was placed on lock down immediately after the shooting.
The student wounded in the attack sustained minor cuts from window that shattered in the car he was riding in. No other injuries were reported, according to the Post.