Officials are still investigating a shooting at the Centers for Disease Control and Prevention headquarters in Atlanta, Georgia, that killed a police officer on Aug. 8. The suspect, Patrick Joseph White, 30, may have been disgruntled over vaccine side effects before perpetrating the shooting, according to multiple reports.

Officer David Rose, 33, was shot and rushed to Emory University Hospital. He was later pronounced dead. The suspected shooter, who the GBI has identified as 30-year-old Patrick Joseph White, was also killed in the incident. Rose was responding to the threat of an active shooter at Clifton Road and CDC Parkway when he was fatally wounded.