WASHINGTON (AP) — A bomb threat has been called in to the Walter Reed National Military Medical Center, forcing a building to be closed for three hours at the facility outside Washington.

A military official says someone phoned in a threat minutes before 9 a.m.  Wednesday, saying a bomb would detonate about an hour later in the center’s America building, which contains a group of clinics.

READ MORE: FDA, CDC Recommend ‘Pause’ For Johnson & Johnson COVID-19 Vaccine Over Clot Reports

The official spoke on condition of anonymity because he was not authorized to publicly release information about the incident.

READ MORE: Baltimore City Police Search For Missing 86-Year-Old Woman

He says the building was swept for explosives, and none was found, and that the building was reopened at 1 p.m.

MORE NEWS: Johns Hopkins University Requiring All Students To Get COVID-19 Vaccine To Come Back To Campus This Fall

(Copyright 2012 by The Associated Press. All Rights Reserved.)