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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Inventor Lonnie Johnson stands with his Super Soaker water guns at JTEC Energy on Wednesday, Oct. 29, 2025, in Atlanta. Johnson, a former NASA engineer, is currently working on a new energy technology through his company’s JTEC device that turns thermal heat into usable energy. (Natrice Miller/AJC)