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 Georgia Bureau of Investigation identified the gunman as 30-year-old Patrick Joseph White, of Kennesaw, Georgia.

Employees at the Centers for Disease Control and Prevention now fear going to work after a gunman sprayed bullets at the agency’s Atlanta headquarters Friday evening, three agency staffers said. “Even the ones who weren’t in lockdown for seven hours and are ridiculously traumatized

US Centers for Disease Control and Prevention Director Susan Monarez vowed to rebuild trust with the American public after the agency was the target of a deadly shooting last week, but some staff were frustrated that she didn’t offer more information on safety.