Another student has been arrested in Clay County after allegedly threatening to shoot up Keystone Heights Junior/Senior High School.

Administrators at the school learned that someone had wrote on the boy's bathroom ceiling "I'm going to shoot up the school."

They reviewed video surveillance and identified a 15-year-old boy as the suspect.

After questioning, the boy confessed to the incident and was arrested. Weeks ago, CCSO Sheriff Darryl Daniels said students could face a second-degree felony, which could mean 15 years in prison.

READ MORE: 'Knock it off': Clay Co. Sheriff warns kids to stop making school threats

Since the Parkland school shooting that claimed the lives of 17 people, there have been more than 600 copycat threats targeting schools.