The Latest: Navy: Notification error led to shooter report

BETHESDA, Md. (AP) — The Latest on reports of an active shooter at Walter Reed National Military Medical Center (all times local):
7 p.m.
The U.S. Navy says a mistake using a mass notification system led to reports of an active shooter at Walter Reed National Military Medical Center.
A statement released Tuesday evening says that while preparing for an upcoming drill at Naval Support Activity Bethesda, the notification system was inadvertently activated without the words “exercise&rd