The Cypress-Fairbanks Independent School District in Houston will spend $55 million to buttress school security. Upgrades will include strategically placed panic buttons and installing bullet-resistant glass in existing windows.

The district also plans to add security vestibules to the front office areas of 50 schools to keep unapproved visitors from gaining access, as well as upgrade security cameras and install lockdown buttons and stand-alone emergency phones at all schools.

Voters overwhelmingly approved the improvements, which will be completed by 2020, in a $1.2 billion bond election in May.