Right before students were to take part in a national protest opposing gun violence, a student was shot and injured at a high school in Florida on Friday, CNN reports.

The 17-year old student was shot in the ankle at Forest High School in Ocala, Fl. and taken to a hospital, Kevin Christian, spokesman for the Marion Public Schools. It’s not considered a life-threatening injury.

A school resource officer took a 19-year suspect into custody three minutes after the shooting. The person was not a student, per CNN.

“It’s a shame what society has come to in that we even have to be here on a school campus,” Marion County Sheriff Billy Woods said to a throng of reporters “Society has changed since I was in school. … We as a whole need to do something. My emotions are running rampant.”

Students used desks and chairs to barricade themselves in their classrooms.

https://twitter.com/RoboKast/status/987326650261168128

The latest incident was the 20th school shooting of the year and comes two months after a gunman walked into a Parkland, Florida high school and killed 17 people.