VOLUSIA COUNTY, Fla. — Volusia County Public Schools locked down all of its campuses Thursday as part of a state-required active shooter drill.

The district had its 85 schools walk through what to do if there is ever an active shooter on campus.

The state now requires one active shooter drill at all schools per semester. It’s one prerogative based on a law passed earlier this year after a gunman killed 17 students and staff members in February at Marjory Stoneman Douglas High School.

Volusia County Public Schools did not say what time the drill would happen. However, they did give parents a heads up that the drill would happen Thursday.

The short lockdowns were lifted before noon at all schools.

The drill includes potential evacuations, taking shelter, barricading the classroom door, turning off lights and devices, and staying quiet to make the classroom appear empty.

The school district made a video to show students what would happen and what they should do.

The video, which is seen below, features Volusia County Schools Safety and Security Specialist Craig Pender talking about different situations, including a situation in which a gunman comes into a classroom.

"If an intruder were to gain access to your room, be prepared to defend yourself. Throw whatever you can grab at the intruder," Pender says.

Elementary school students were not shown the video but were taught about safety procedures prior to the lockdown drill.

Older students deemed "fragile" also will not be shown the video, but will instead be read a script, according to the school district.

"At all levels, if there is a group of fragile students identified that the video doesn't seem appropriate to show, the teacher should use the elementary script for those students in the secondary schools," the school district said in a statement.

That was the case last week at Brantley High School in Seminole County where students and parents were panicked following an unannounced and confusing “code red” drill.

Seminole County Sheriff Dennis Lemma announced this week revisions to the school district’s drill policies to ensure there is not a repeat of unnecessary panic and confusion in the future. 

Orange County Public Schools says it has carried out active shooter drills since 2014, but this year has expanded their program to include further training where law enforcement is more proactive with school district staff in planning and preparing for possible active shooter situations. 

Reporter Greg Angel contributed to this story.