Homeland Sec.: 'Unfolding situation' at Andrews Air Force Base
Homeland secretary Jeh Johnson has confirmed that a "situation is unfolding" at U.S. Joint Base Andrews in Maryland following reports of an active shooter at the base, The Associated Press reports.
The base was placed on lockdown and personnel were told to shelter in place, base officials said on Twitter.
The base is in Maryland, about 15 miles (24 km) from the White House.