JOINT BASE ANDREWS, Md. (AP): Joint Base Andrews tweets that the base is on lockdown due to a report of an active shooter.

The tweet sent Thursday morning instructs all personnel at the base in Washington’s Maryland suburbs to shelter in place and says more information will be released as it comes.

A second tweet from the base says the incident is ongoing at the Malcolm Grow Medical Facility and first responders are on the scene. It instructs everyone to continue to shelter in place, a precaution meant to keep people safe while remaining indoors.

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 (@JBA_NAFW) June 30, 2016