Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Search Begins for Remains of Tulsa Race Massacre Victims VOA News U.S. researchers have begun searching for the unmarked mass graves of an estimated 300 African Americans who were killed in the Tulsa Race Massacre nearly a century ago. Test excavations began Monday in Oaklawn Cemetery in Tulsa, Oklahoma, located in the south-central region of the U.S., after a radar search earlier this year revealed the possibility of mass graves. The search was postponed in March because of the coronavirus pandemic and involves the use of a backhoe to remove the first layer of soil before more delicate tools are used if remains are discovered, said Oklahoma State Archaeologist Kary Stackelbeck. The Tulsa Race Massacre, also known as the Tulsa Race Riot, during which white mobs murdered Black residents and destroyed businesses in an affluent area known as Black Wall Street, is arguably the worst outbreak of racial violence in U.S. history. Eighteen hours of violence that erupted on May 31, 1921, left the city's prosperous Black community of Greenwood burned to the ground. .