A student is in custody after authorities said a threat was made at Savannah High School Monday morning.

Sgt. Corey Root with MSHP said a 16-year-old girl is being referred to juvenile authorities after Savannah High School officials placed the school on lockdown.

“Around 8-thirty this morning, school officials received what they believed was a threat for student safety. Therefore they notified law enforcement,” Sgt. Root said. “Savannah Police Department, Andrew County Sheriff’s Department, Missouri State Highway Patrol responded.”

The Savannah R-III school district confirmed in a news release that a threatening note was found in the girl’s restroom Monday morning.

The district said by 9 a.m. a student was identified as a possible suspect and was isolated in the office.

“There was a threat that was made and obviously all threats are taken as credible and the response from local law enforcement was made,” Sgt. Root said.

The district said movement in the high school was restricted and students and staff remained in classrooms for about 45 minutes with several law enforcement officials present throughout the school until the possible suspect was identified.