PARKLAND, FL - Students at Marjory Stoneman Douglas High School were put on “code yellow” status – not allowed to leave their classrooms – on Friday afternoon, as school officials investigated two students who jumped over a fence and left the campus, school officials said.

Students in the school remained in their classrooms, along with their teachers, for just under 20 minutes until it was determined that there was no danger to the student body and employees, Principal Michelle Kefford said in a robocall to parents.

As a precaution, students at nearby Westglades Middle School in Parkland were also placed on code yellow over the same time, from 1:37 p.m. to 1:54 p.m., Principal Matthew Bianchi said in a similar robocall to parents. He added the incident happened near the construction of the new building at the Marjory Stoneman Douglas campus.

The school, which serves students in Parkland and Coral Springs, was the site of a mass shooting on Valentine’s Day 2018 that left 14 students and three employees dead.