Daily Mail: BREAKING NEWS: Joint Base Andrews on lockdown amid reports of an active shooter just before Biden was due there to take off
* Active shooter drill was supposed to start at the Maryland base at 9am
* But at 9am an alert was issued saying there was a 'real world' shooter
* The situation is unfolding at the base's Malcolm Grow Medical Facility
* Security tightened at other nearby army and naval bases
* VP Joe Biden was due to fly out of the base on Thursday morning
Vice President Joe Biden was due to arrive to board a plane.
All personnel were ordered to shelter in place shortly after 9am Eastern Time.
It came at the same time that an active shooter training exercise was due to start at the base.
Vice President Biden was scheduled to fly out of Joint Base Andrews on Thursday morning to give a noon address on cancer treatment and funding in Cuyahoga County, Ohio.
He is now waiting at the Naval Observatory for further information.
Officials tweeted that the situation is centered on the base's Malcolm Grow Medical Facility.
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WNU Editor: This is a breaking story. It will be updated when more news becomes available.
More News On Andrews Air-force Base On Lock-Down
U.S. Joint Base Andrews on lockdown after report of gunman on the loose -- Reuters
Andrews Air Force Base on lockdown due to report of active shooter -- NPR
'Gunman' at key US Air Force base -- BBC
Andrews Air Force Base under lockdown due to reported active shooter -- CBS
Joint Base Andrews on lockdown, reports of active shooter -- UPI
Andrews Air Base on lockdown amid 'active shooter' report -- USA Today
Andrews Airforce Base on Lockdown After Shooting Reports -- Sputnik
Joint Base Andrews 'Active Shooter': 5 Fast Facts You Need to Know -- Heavy
Update 11:20 EST: The lock-down has been lifted.