As he grappled with those issues, sources said, White had become increasingly fixated on the COVID-19 vaccine as a source of his grievances. Several Kennesaw residents who knew the 30-year-old suspected shooter told ABC News they had heard White express similar angry and conspiracy-minded sentiments.

A Georgia man who opened fire on the U.S. Centers for Disease Control and Prevention headquarters, shooting dozens of rounds into the sprawling complex and killing a police officer, had blamed the Covid-19 vaccine for making him depressed and suicidal,