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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A migrant farmworker harvests Vidalia onions at a farm in Collins, in 2011. A coalition of farmworkers, including one based in Georgia, filed suit last month in federal court arguing that cuts to H-2A wages will trigger a cut in the pay and standard of living of U.S. agricultural workers. (Bita Honarvar/AJC)

Credit: Bita Honarvar