BATON ROUGE - Two employees at Istrouma High are currently on administrative leave while the school investigates how a gun got onto campus and went off in a classroom.

The East Baton Rouge Parish School System said the principal, a teacher and an office clerk were put on leave. As of Tuesday, the principal is back at school. 

WBRZ previously reported that on Wednesday, 18-year-old student Marcus Washington Jr. was arrested after he allegedly brought a stolen gun with a switch to school.

It went off in a classroom. The school district said the weapon was accidentally discharged into the ceiling. 

The gun was reportedly found hidden in a ceiling tile. 

Washington Jr. was booked for carrying a firearm on school property, negligent carrying of a concealed, illegal use of weapons, possession of machine guns, and illegal possession of a stolen firearm.