1968 Washington, D.C., riots

Following the assassination of Martin Luther King Jr., a leading African-American civil rights activist, on April 4, 1968, Washington, D.C., experienced a four-day period of violent civil unrest and rioting. Part of the broader riots that affected at least 110 U.S. cities, those in Washington, D.C.—along with those in Chicago and in Baltimore—were among those with the greatest numbers of participants.

Source: Wikipedia — 1968 Washington, D.C., riots (CC BY-SA 4.0)