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

Gunman Patrick Joseph White expressed discontent with the COVID-19 vaccinations in writings he made before the shooting, authorities said.

Investigators released a photo on Tuesday of the gunman, Patrick White, of Kennesaw. Channel 2 Cobb County Bureau Chief Michele Newell has been digging into White’s past, where she learned his father had called police about White’s mental health. GBI director Chris Hosey said White took his father’s guns for the attack.