The Evacuation of Washington's Union Station

The U.S. capital’s transportation hub was briefly cleared out Wednesday after reports of a potential threat.

Washington, D.C.’s main train station was briefly evacuated Wednesday during end-of-day rush hour following reports of a suspicious package, according to police and reports on social media.

People outside of Union Station posted video footage at about 5:30 p.m. local time showing hordes of people leaving the building, and police sirens could be heard in the background. Police swept the station, and about half an hour later said no threat was found. People were then allowed back inside.

Here’s the scene from the evacuation:

Mass exodus at union station. Police swarming. Entire place evacuated. @nbcwashington pic.twitter.com/6i2fCM9u1B

— Nate O'Connor (@nwoconnor) July 27, 2016

Scene outside Union station. A few cop cars making their way up; you keep hearing more sirens. pic.twitter.com/f6S9wIrFEr

— Stephanie Levy (@stephanie_levy) July 27, 2016

Metro Police said on Twitter officers investigated the suspicious package with the help of police dogs:

MTPD K-9 units are assisting AmtrakPD w/investigation of package in Amtrak portion of station. Metro service operating unaffected. #wmata

— Metro Transit Police (@MetroTransitPD) July 27, 2016

Union Station has a number of transportation services, including the Washington metro, Amtrak, the MARC commuter rail service, and buses. It also houses shops and restaurants.

About 40 million people visited Union Station each year, including 15.5 million local residents, according to its website. The website estimates 75 percent of all Capitol Hill employees pass through the station each day.