Active shooter scare at Walter Reed was a drill: Authorities

The Navy said "the notification system was inadvertently enacted without containing the words "exercise" or "drill".
1:49 | 11/28/18

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Transcript for Active shooter scare at Walter Reed was a drill: Authorities
And we begin with that emergency alert that went out at Walter reed medical center in bethesda, Maryland. It prompted a massive police response. People there running for cover, tweeting loved ones about the scare. Authorities with their guns drawn. U.S. Navy officials then saying it was just a drill, and tonight, the Navy saying just moments ago that this active shooter scare was the result of, quote, improper use of a mass notification system. ABC's David Kerley leading us off. Reporter: Tonight, details of that scare at Walter reed medical center. Early reports of an active shooter, people sent scrambling. It was a large response of S.W.A.T. Teams and police, converging on the military hospital. It turns out a unit was preparing for an active shooter drill when someone activated a notification system. An alert going out without declaring that it was only a drill. Security then notified local and state police. A member of congress among those inside the hospital, sent into a panic. I'm going to check with the defense department and find out who was in charge of this. You know, why did it happen this way? Because people could have been hurt. A lot of anxiety that we didn't need to have. Reporter: The hospital was put on lockdown, patients and staff moved to secure locations. It was a tense time. David Kerley joins us live from Washington. David, let's go back to the statement they just put out. The Navy saying that this was because of improper use of the hospital's emergency alert system? Reporter: They were preparing to do this exercise, David, and somebody inadvertently started the notifications, it's called a mass not if I case system. The problem is, the text didn't include the word drill or exercise. A major scare from a mistake. David Kerley leading us off tonight. David, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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