This is a developing story. Stay updated, some details may change.
Joint Base Andrews is currently on lockdown due to a reported active shooter situation and all personnel are being asked to shelter in place, according to Joint Base Andrews Twitter account.
JBA is currently on lockdown due to a report of an active shooter. All personnel are directed to shelter in place. More info as it comes.
— Joint Base Andrews (@Andrews_JBA) June 30, 2016
The incident is ongoing at the Malcolm Grow Medical Facility, we’ve been told. First responders are on-scene now.
Reports of an active shooter @JBA_NAFW. All in and near the facility are directed to take cover. Base personnel should stay clear of area.
— Rushern L. Baker III (@CountyExecBaker) June 30, 2016
We have been informed that the base was scheduled to conduct an active shooter exercise this morning, when reports of a “real-world” active shooter situation were reported at the grow facility.
The base says that “due to the seriousness of this report, the base is reacting to ensure the safety of all personnel.”
Reports of an active shooter at Joint Base Andrews in Maryland have been deemed unfounded after someone mistook an active shooter drill for the real thing, senior law enforcement officials told NBC News.
The base was locked down just after 9 a.m. and all personnel were directed to shelter in place. The lockdown at the base has been lifted, but the investigation at the medical center continues.
Officials at the base said they were conducting an active shooter exercise at 9 a.m., but around the same time, first responders received reports of an “real-world active shooter situation” at the Malcolm Grow Medical Facility.
Someone on the third floor of the medical facility saw two people walking across the base with long guns. The person didn’t know there was a drill planned and called in the active shooter report, law enforcement officials told NBC News’ Pete Williams.
Rodney Smith, a patient advocate at the medical facility, told The Associated Press the situation was unfolding at the newer of two buildings at the Malcolm Grow Medical Facility. Smith was in the older building.
Joint Base Andrews, in Prince George’s County, Maryland, is the home of Air Force One and to other emergency reaction units for the area around the nation’s capital.
Homeland Security Secretary Jeh Johnson called the incident an “unfolding situation” during his testimony at the Senate Judiciary Committee’s hearing on oversight of the Department of Homeland Security.
Prince George’s County — which would normally assist Joint Base Andrews during a security incident — said it was not assisting with any emergency response.