Authorities gave the all clear at Walter Reed National Military Medical Center in suburban Washington, the biggest military hospital complex in the world, after a report of a gunshot triggered a lockdown on Monday, the U.S. Navy said.
Police found no sign of a gunshot or injuries at the sprawling 243-acre (98-hectare) campus in Bethesda, Maryland, the Navy said on its Twitter feed. A call to police reporting the sound of a gunshot triggered the lockdown of the Bethesda, Maryland, site and a massive security response.
Officers cleared the 20-story building where the gunshot was reported and found nothing, the Montgomery County Police Department said on Twitter.
Police said non-emergency patient care at Walter Reed was suspended for the day.
The Walter Reed report came after an unfounded call of a gunshot at the Washington Navy Yard sparked a heavy police response on Thursday.