The FBI says more than 500 shell casings have been found around the scene of last week's shooting near the CDC headquarters in Atlanta. On Tuesday, authorities released the 911 call from the suspect's father following the shooting.

The gunman who opened fire Friday at the US Centers for Disease Control and Prevention broke into his father’s safe to get the five firearms recovered at the scene, state investigators said Tuesday, as some CDC workers seeking answers and reassurance from leadership were left dissatisfied by a short agency-wide meeting about the shooting.

The man who fired more than 180 shots at the headquarters of the US Centers for Disease Control and Prevention (CDC) in Atlanta last week died of a self-inflicted gunshot wound after killing a police officer,