Maryland naval facility sent into lockdown after reports of active shooter & bomb threat prompt site-wide search

A naval base in Bethesda, Maryland went on lockdown on Wednesday after authorities received a phone tip-off that there was a bomb in one of its buildings. There was also an initial report of an active shooter threat at the site.Staff at US Naval Support Activity Bethesda (NSAB), home to Walter Reed National Military Medical Center, were told to “shelter in place” on Wednesday morning as emergency teams investigated the threats. 
Shortly before 9am local time (12pm GMT), official