The suspect in the shooting targeting the Centers for Disease Control and Prevention had letters that showed his “discontent” with COVID-19 vaccines.

White had been stopped by CDC security guards before driving to a pharmacy across the street, where he opened fire from a sidewalk, authorities said. The bullets pierced “blast-resistant” windows across the campus, pinning employees down during the barrage. More than 500 shell casings have been recovered from the crime scene, the GBI said.