JOINT BASE ANDREWS, Md. — A law enforcement official says no active shooter was found at a military post outside Washington.
The law enforcement official was not authorized to discuss the matter by name and spoke on condition of anonymity.
Joint Base Andrews had been placed on lockdown Thursday morning after an active shooter was reported. The base is home to Air Force One and is about 20 miles from Washington.
An active shooter exercise had also been planned at the base, but officials said the situation became "real world."
The situation unfolded at a medical facility on the post. Joint Base Andrews issued a tweet telling all personnel at the base in Washington's Maryland suburbs to shelter in place.
EARLIER:
JOINT BASE ANDREWS, Md. — Joint Base Andrews tweeted Thursday that the base was on lockdown due to a report of an active shooter.
The tweet instructed all personnel at the base in Washington's Maryland suburbs to shelter in place and says more information will be released as it comes.
Homeland Secretary Secretary Jeh Johnson called it an "unfolding situation."
A second tweet from the base said the incident was ongoing at the Malcolm Grow Medical Facility and first responders were on the scene. It instructed everyone to continue to shelter in place, a precaution meant to keep people safe while remaining indoors.
Joint Base Andrews is located about 20 miles outside of downtown Washington, D.C. and hosts aircraft used by President Obama.