This story has been updated.
Joint Base Andrews military facility in Maryland has been given the all clear Thursday morning after a report of an active shooter prompted its lockdown, the base announced at 10:40 a.m.
All personnel were directed to shelter in place around 9:30 a.m. following the report, Joint Base Andrews said in a post on Twitter.
“The base was scheduled to conduct an active shooter exercise, however, reports of a real-world active shooter situation were reported at Malcolm Grow medical facility,” according to a statement by Joint Base Andrews.
" 'All Clear' for the base with the exception of Malcolm Grow medical facility," the base stated in a post on Twitter after the lockdown had been lifted.
Joint Base Andrews, located in Prince George's County, is the home of Air Force One, which landed there Wednesday night following President Obama’s trip to Canada.
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