The man who opened fire at the U.S. Centers for Disease Control and Prevention headquarters last week, killing a police officer, died by suicide, the Georgia Bureau of Investigation said Tuesday.

The shooter, whom authorities identified as Patrick Joseph White, 30, “died from a self-inflicted gunshot wound,” the bureau’s director, Chris Hosey, said Tuesday at a news conference.

“Evidence in this event indicates that the shooter had recently verbalized thoughts of suicide, which even led to law enforcement being contacted several weeks prior to the incident,” Hosey said, flanked by other officials.

Hosey added that White fired nearly 200 rounds of ammunition at the headquarters and that authorities recovered five guns and “over 500 shell casings” from the scene.

The five weapons, which belonged to White’s father, were securely stored before the shooter “forced his way into” the safe that contained them, Hosey added.

He also said authorities had recovered “written documentation that expressed the shooter’s discontent with the Covid-19 vaccinations” from White’s home.