BLOUNTSVILLE, Ala. — Police have arrested a substitute teacher in Alabama after his gun went off in a first-grade classroom.

Officials say one juvenile received minor injuries but was treated at the scene and released.

Blount County Sheriff Mark Moon says students were in the classroom with 72-year-old Henry Rex Weaver at Blountsville Elementary School when a gun that was in his pocket discharged.

Administrators were alerted, and the man was detained until authorities arrived.

Moon says he is concerned that a substitute teacher brought a firearm to school. 

Weaver is charged with possession of a deadly weapon on school grounds, 3rd degree aggravated assault and reckless endangerment.