In the early 20th century, Tulsa was home to the "Black Wall Street", one of the most prosperous Black communities in the United States at the time. Located in the Greenwood neighborhood, it was the site of the Tulsa Race Massacre, said to be "the single worst incident of racial violence in American history", in which mobs of white Tulsans killed black Tulsans, looted and robbed the black community, and burned down homes and businesses. Sixteen hours of massacring on May 31 and June 1, 1921, ended only when National Guardsmen were brought in by the Governor. An official report later claimed that 23 Black and 16 white citizens were killed, but other estimates suggest as many as 300 people died, most of them Black. Over 800 people were admitted to local hospitals with injuries, and an estimated 1000 Black people were left homeless as 35 city blocks, composed of 1,256 residences, were destroyed by fire. Property damage was estimated at . Efforts to obtain reparations for survivors of the violence have been unsuccessful, but the events were re-examined by the city and state in the early 21st century, acknowledging the terrible actions that had taken place.