HISD has released the following statement on the Santa Fe High School shooting:

The Houston Independent School District sends condolences to the entire Santa Fe ISD community. Our thoughts and prayers are with all of the students, staff, and families affected by this senseless tragedy. We offer our full support to Santa Fe ISD during this difficult time. The HISD Police Department has more than 200 officers assigned to schools and facilities across the district, and they work diligently every day to keep HISD students and staff safe. Today, the department is operating on high alert, and all available officers are on patrol. Additionally crisis counselors are available to students upon request.

Read more:
Letter to parents and community members
Letter to staff