The man who fired more than 500 rounds at the US Centers for Disease Control and Prevention appears to have tried to get onto the agency's campus two days before the August 8 shooting, according to an agency email obtained by CNN.

The video featured is from a previous report.

During the investigation, the CDC's Office of Safety, Security, and Asset Management and the Georgia Bureau of Investigation discovered video footage that shows a man resembling the shooter, Patrick Joseph White , trying to enter the CDC's main campus on the afternoon of Wednesday, August 6.

He tried to enter the campus at the first guard station but was turned away by CDC security "without incident." The shooter did not attempt to enter the campus on Friday, August 8, prior to the attack, the email said.

"The v

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