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 suspected of opening fire on CDC buildings in Atlanta had interacted with police after expressing thoughts of suicide, officials said.

Documents found in a search of the home where Patrick Joseph White lived with his parents “expressed the shooter’s discontent with the COVID-19 vaccinations,” authorities said.

A search of Patrick Joseph White’s home revealed documents in which he indicated his discontent with the vaccine, they said.