The Billings Gazette reports that an art teacher at Hardin High School has been arrested for having a gun on campus, tampering with evidence and obstruction of justice in connection with a weapon found in a school classroom over the weekend. An arrest warrant has also been issued for an unidentified male student for attempted armed robbery, carrying a concealed weapon and having a gun on school property.

The teacher arrested is Nora Block, according to Big Horn County Undersheriff Michael Fuss. The charges stem from an incident that began Friday, when school officials responded to a report that a student had a gun at school, and found him in Block’s classroom. No gun was found, but sheriff’s deputies returned to the school Saturday and were told that Block found the gun while cleaning the classroom, according to reports.