No evidence of a shooting was found after reports of a shot being fired at Walter Reed National Military Medical Center led to a lockdown at the Bethesda, Md., facility on Monday, according to ABC News.

On Monday, a 911 call came reporting one shot being heard inside Building One of Walter Reed. Montgomery County Police Capt. Paul Starks tweeted that they were asked to assist Walter Reed federal partners after the report. However, at 2:12 p.m., the Navy gave the "all clear" via Twitter, according to the Atlanta Journal Constitution.

This 243-acre campus, which employs 8,500 people and serves more than one million patients every year, had to suspend its non-emergency medical care to give way for the clearing operations. After receiving the report that at 10:48 a.m. a shot was fired, the officers had to be extra cautious and escorted the medical personnel and other workers from one building to the parking lot. But more than an hour later, there still had been no confirmation on the reported shooting. At the time, police stated that they were still sending additional forces "out of an abundance of caution", according to USA Today.

"All base personnel are sheltering in place as a result of unconfirmed reports of an active shooter. DOD Security Force, NIH Police Force and County EMS and Medics have responded and searching the area," stated the Navy.

After the announcement of the shelter in place order and more than an hour of no confirmation of shots, Montgomery County Police tweeted that they had decided to suspend the patient care at the facility for the rest of the day. "Police operations are complete; there is no evidence of a firearm discharge. Normal operations expected to resume," the police reported.

Days before the incident, the police and federal officers joined forces in responding 25 miles away from the Walter Reed after receiving a report of a possible gunman at the Washington Navy Yard.