Officials lifted their lockdown of the Bethesda military installation that houses Walter Reed National Military Medical Center and other facilities after spending Wednesday morning investigating a possible bomb threat.

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       An all clear was issued Wednesday afternoon, hours after authorities shut down roads in the area and told people on the facility to shelter in place.

       Authorities said they received a call just before 9 a.m. from “an anonymous source stating there is a bomb at or near Building 10,” according to a Twitter alert.

       There were no reports of any explosives found. By 1:30 p.m., NSA Bethesda had lifted shelter in place orders at the entire facility.

       Patient appointments at the hospital on Wednesday were cancelled, and officials encouraged people to reschedule.