Authorities said Tuesday that investigators recovered at least 500 shell casings at the scene, estimating that White fired more than 180 shots at the CDC headquarters using his father’s long gun. White shot and killed himself at the scene before responding officers could reach him.

Speaking to reporters on Tuesday, Georgia Bureau of Investigations Director Chris Hosey said 500 shell casings were recovered from the scene, while its believed 200 rounds hit six buildings in the CDC complex. Five firearms were also recovered, he said.

The man suspected of opening fire outside the Atlanta headquarters of the Centers for Disease Control and Prevention on Friday had been critical of the Covid-19 vaccine, authorities said.A search of Patrick Joseph White’s home revealed written documents in which he indicated his discontent with the vaccine,