A 15-year-old student is charged with making a terrorist threat against a north Alabama high school.

WHNT reports that the Limestone County Sheriff’s Office says the teen made a threat via social media against Elkmont High School on Friday. The teen was arrested about an hour later.

The sheriff’s office said making threats of violence against a school is a serious offense.

Elkmont High School said in a statement on Facebook that school administrators learned about the threatening statements and contacted authorities.

The school said law enforcement acted quickly to take the student into custody. The school resumed normal operations.