Horne added that Maryvale has safety plans in place and a school safety officer (SSO) on campus during school hours. The difference between an SSO and a school resource officer (SRO) is that SROs are on school campuses full-time while SSOs are there one day a week, Horne said.

Maryvale High School in west Phoenix is currently under lockdown after an incident in a classroom that injured a student.