The Pentagon said an active shooter scare at Walter Reed National Military Medical Center on Tuesday afternoon was actually a drill – an exercise that sent shaken people, including a sitting member of Congress, scrambling for cover.
Authorities were deluged with calls for help to 911 from many inside the facility, including some hiding in a back room at the hospital. The incident also prompted a lockdown at the hospital's campus, about 10 miles north of Washington.
Montgomery County Police officer Rick Goodale said police were called to the scene Tuesday just after 2:20 p.m.
Multiple officials said patients and staff were told to move to secure locations and were advised to remain on lockdown until notified by security. It's unclear why this was done if the incident was a drill.
https://www.usatoday.com/story/news/nation/2018/11/27/walter-reed-medical-center-active-shooter-reported/2128112002/