United States Capitol Building (illustration)
United States Capitol Building (illustration)iStock

After a short lockdown, the U.S. Capitol was given the "all clear" sign shortly before 5:00 p.m. Tuesday afternoon.

NBC News reported that the complex was placed on lockdown earlier as authorities investigated a report of someone with a weapon outside.

Police told NBC News that two people are in custody. One had a weapon in his waistband.

While the incident is still under investigation, there have been no reported shootings or injuries, according to the report.

The U.S. Capitol Police had issued a lockdown alert at about 4:15 p.m local time and advised staffers and visitors to “close, lock and stay away from external doors and windows” and “move to your office’s assigned shelter in place location or the innermost part of the office,” The Washington Post reported.

The incident follows several days of tension following last week's attack in Dallas, in which a sniper killed five police officers.

On Monday, two court bailiffs were killed in a shooting attack outside the Berrien County courthouse in St. Joseph, Michigan.

The incident reportedly occurred when a man who was on his way to jail took a gun off a deputy and started opening fire.