Joint Base Andrews on lockdown due to active shooter

The incident is ongoing at the Malcolm Grow Medical Facility at Joint Base Andrews, the base said on its official Twitter account. First responders are on-scene now.
All personnel have been directed to shelter in place.
“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 released by the base.
The U.S. military facility, located in Prince George’s County, Md., is the home of Air Force One.