No evidence of active shooter at Walter Reed, police say

Police say there is no indication there was a shooting at Walter Reed National Military Medical Center on Monday after an unconfirmed report of an active shooter on the hospital's Bethesda, Md., campus triggered a lockdown.

According to police in Montgomery County, a 911 caller reported hearing one shot fired inside Building 1 at approximately 10:48 a.m.

The facility was placed on lockdown while local police and federal agents searched the area.

Employees were seen being evacuated from a building with their hands raised.

Staffers sheltering in place tweeted updates from inside the facility.

Others called their family members, who relayed messages via Twitter.

Nearby roads were also closed as a precaution.

At a 1 p.m. press briefing, Montgomery Capt. Paul Starks said officials were close to completing a sweep of Building 1 and there was "no indication of any kind" that there was a shooting, and no injuries reported.

Once the building is cleared, Starks said, it would searched by bomb-sniffing dogs "out of an abundance of caution."

The sweep was completed at 1:30 p.m., police said.

Last week, a report of possible gunshots heard by an employee at the Washington Navy Yard triggered a massive law enforcement response. But a subsequent search found no evidence a shooting had occurred.

That false alarm came two years after a gunman opened fire inside a building at the Navy Yard, killing 12 people and injuring three others.