US base Andrews on lockdown due to 'active shooter'
US Joint Base Andrews outside Washington DC has been placed on lockdown amid reports of an active shooter, the military facility has said.
"The incident is ongoing at the Malcolm Grow Medical Facility. First responders are on scene now. All personnel continue to shelter in place," the base said on on Twitter on Thursday.
"The base was scheduled to conduct an active shooter exercise, however, reports of a real-world active shooter situation were reported."
Homeland Security Secretary Jeh Johnson told politicians there was an "unfolding situation" at the base, adding he might need to take a break in his testimony to address the situation.
Joint Base Andrews, located in Maryland, is home to thousands of military personnel and their families.