A mass evacuation took place at Alpharetta’s jail annex in northen Fulton County jail Tuesday morning — but it was a drill, and not due to an actual emergency.

The time of the exercise was not announced in advance for security purposes, according to a Tuesday morning news release.

During the drill, all visitors and civilian employees were instructed to leave the 2565 Old Milton Parkway building. Deputies simulated transporting a small number of inmates to another secure location, and evacuees were directed to “safe areas outside the hot zone.”

Regular operations resumed once the designated sections had been cleared and the situation “was resolved.”

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“The exercise of mass evacuation drills is an important aspect of maintaining the accreditation of the Fulton County Jail system,” the release said. “It is crucial that we all be prepared and follow proper procedures to safely evacuate the facility in the event of an actual emergency.”