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 accused of killing a police officer while shooting at the U.S. CDC headquarters on Friday had been reported to police three times for suicidal thoughts and wanted to send a message against COVID-19 vaccines,