DEVELOPING: Shots Fired at Santa Fe High School, Up to 10 Dead 9:11 a.m. According to CNN, a gunman entered the high school and opened fire in a classroom. Cris Richardson, the assistant principal at Santa Fe High School, told CNN the suspect "has been arrested and is secured." One person has been taken into custody, and a second person has been detained, multiple reports confirm. Harris County Sheriff Ed Gonzalez confirmed at least 10 were killed, most of them students. President Trump has been briefed on the shooting. Police are also reporting that explosive devices have been found at the school and off campus.