After the assassination of civil rights leader Dr. Martin Luther King Jr., on April 4, 1968, riots broke out in the district, primarily in the U Street, 14th Street, 7th Street, and H Street corridors, centers of black residential and commercial areas. The riots raged for three days until more than 13,600 federal troops and D.C. Army National Guardsmen stopped the violence. Many stores and other buildings were burned; rebuilding was not completed until the late 1990s.