Wednesday morning, Walter Reed National Military Medical Center showed all appointments at the center were suspended "until 13:00." There were also reports that there was a threat and Building 9 was evacuated. We were then able to get an email sent to staff at Walter Reed Bethesda which said the center was in Code BLACK due to a security concern. The email said no one was allowed to enter or leave building 19 (American Building. Sky 9 captured video above the scene.