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.

A school safety officer for the high school was alerted by staff that an assault had happened in one of the classrooms, police said.

Phoenix Police say a fight at Maryvale High School sent two students to the hospital, with one of them suffering life-threatening injuries. FOX 10's Kenzie Beach has the latest.

The Phoenix Union High School District superintendent says class will resume on a modified schedule with counseling services made available to students and staff.