UPDATE June 18 at 6:40 p.m. EST
A noose was found hanging from a lamp post near the National Gallery of Art on Saturday afternoon, according to authorities.
This is the sixth noose that's been found near the nation's capital in recent weeks.
Last month nooses were found at the National Museum of African American History and Culture and the Hirshhorn Museum, which, along with the National Gallery of Art, are located on the National Mall.
UPDATE June 3 at 9:00 p.m. EST
There have been at least five nooses found near the nation's capital in recent weeks.
Police responded to a house under construction in southeast Washington Thursday morning and discovered a noose by the front door. The project manager told ABC affiliate WJLA the noose was not there the day before when he left work.
Before this, two nooses were found at the National Museum of African-American History.
In early May, bananas were found hanging from nooses around American University's campus. The bananas had the words "AKA Free" written on them, which may be in reference to the predominately African-American sorority, Alpha Kappa Alpha.
A noose was also left in the kitchen of the Phi Kappa Tau fraternity house at the University of Maryland.
On Friday, a noose was found on a bench at Washington's MLK Center.
Original story below
Visitors were removed from a section of the newly-opened National Museum of African American History and Culture in the Nation's Capitol on Wednesday after a noose was found on the floor of one of the rooms, according to BuzzFeed. The rope was discovered by a tourist inside one of the museum's three history galleries, the Era of Segregation 1786-1968, Smithsonian spokeswoman Linda St. Thomas said.
"It was rather a small rope thing and not something that would set off the magnetometers," she said.
"Park Police removed it and we reopened the gallery about an hour later," she continued.
Museum staffers were notified of the discovery in an email written by Smithsonian Secretary David Skorton, who called the discovery "deeply disturbing news."
"The Smithsonian family stands together in condemning this act of hatred and intolerance, especially repugnant in a museum that affirms and celebrates the American values of inclusion and diversity. We will not be intimidated," he wrote in an email later obtained by BuzzFeed.
Last Friday, a noose--a symbol associated with the era of lynching-- was also found hanging on a tree outside the Hirshhorn museum also in D.C., a contemporary art and sculpture museum.
U.S. Park Police are investigating both incidents.
Skorton said counselors are on staff to assist employees.
He wrote to staff, "Cowardly acts like these will not, for one moment, prevent us from the vital work we do. We will remain vigilant and, in spite of these deplorable acts, we will become a stronger institution for all Americans."