The teen’s school feared he could carry out a mass shooting. Prosecutors nationwide are holding parents accountable for children’s access to guns.

The mother was arrested on allegations she purchased ammunition and tactical gear for her son, who authorities said was planning "mass targeted violence" at a San Antonio school.

Warning signs that a San Antonio middle school student had deadly intentions had been building for months, police say. They took on a new urgency Sunday when his grandmother walked into his bedroom.