Update 2:10 p.m.: Medical services at Walter Reed have returned to normal as of 12:50 p.m. and no bomb was found, officials said.

Original Post: Hundreds were evacuated from a building at the Walter Reed National Military Medical Center Wednesday morning after the hospital received a bomb threat by telephone, officials said.

An individual called the hospital at around 8:50 a.m. stating that a bomb would go off in the America building, also known as Building 19, at 10 a.m., said Joe Macri, a spokesman for the Naval Support Activity Bethesda, of which the hospital is a tenant.

Police were still conducting sweeps of the building shortly after noon Wednesday and nobody was being allowed in or out, Macri said.

The hospital’s web site says “All Appointments at Walter Reed Bethesda have been suspended until 13:00.”

Macri said Building 19 conducts most of the hospital’s outpatient services.