WASHINGTON — The man who attacked the Centers for Disease Control and Prevention probably tried to enter the CDC’s Atlanta campus days before the shooting, investigators believe.

The shooter, identified by authorities as Patrick Joseph White, appears to have been captured in security camera footage trying to enter the visitor’s center of the campus late in the afternoon on Aug. 6, according to an internal email to CDC staff, reviewed by STAT. The email said “the likelihood is very high” the person in the video is White.

“At that time, he was stopped at the first guard station and turned away by CDC Security without incident,” Jeff Williams, CDC’s director for the Office of Safety, Security, and Asset Management, wrote in the email. “Due to our existing security protocols, the shooter d

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