Joint Base Andrews was placed on lockdown Thursday morning after a report of an active shooter.
The notice was posted shortly after 9 a.m. ET.
All personnel were directed to shelter in place.
There was a planned active shooter drill today, but the base said on Twitter that reports of a real-world active shooter came in during the drill, prompting the alert.
An all clear was given to base personnel around 10:40 a.m. ET.
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