LINCOLN, Neb. (AP) — Lincoln’s public schools will now be required to conduct two drills to respond to active shooters after a district review of emergency procedures this summer.

The Lincoln Journal Star reports that district administrators re-assessed emergency protocols after a parent group raised security concerns following the mass shooting at a Florida school in February. Parents United for Greater School Safety advocated for more school resource officers, improved security at school entrances and better communication with parents about emergency drills.

Administrators have decided that all schools must conduct two lockdown and lockout drills. Lockdown refers to locking classrooms, turning off lights and getting out of sight. Lockouts involve bringing students inside and locking the school when there’s a threat outside the building.

Teachers will receive training Tuesday on flexible decision-making with a new video on all procedures.