A lockdown at the U.S. Capitol Complex in Washington, D.C., was lifted shortly after reports of shots fired at the Visitor Center Monday afternoon. A suspect is in custody, NPR has confirmed.

News reports said at least one officer had been wounded, but those reports have not been officially confirmed.

Staffers, reporters and others had been told to “shelter in place” and were not being allowed to exit or enter any buildings. Congress is currently in recess. The U.S. Senate Sergeant-At-Arms Office said that the Capitol is open for official business.

The White House was briefly put on lockdown, which was shortly lifted, according to news reports.

Washington’s Metropolitan Police Department tweeted that there “is no active threat to the public.”

The Associated Press reported that “visitors were being turned away from the Capitol as emergency vehicles flooded the street and the plaza on the building’s eastern side. Police, some carrying long guns, cordoned off the streets immediately around the building, which were thick with tourists visiting for spring holidays and the Cherry Blossom Festival.”

The Visitor Center is part of the U.S. Capitol Complex, a group of about a dozen buildings in the nation’s capital, according to its website. The center opened in 2008 and serves as an underground screening point for visitors to the U.S. Capitol. After years of discussion about a facility for visitors, construction on the center began after the 1998 killing of two U.S. Capitol Police officers at the ground floor entrance.

This is a developing story. Some things that get reported by the media will later turn out to be wrong. We will focus on reports from police officials and other authorities, credible news outlets and reporters who are at the scene. We will update as the situation develops.