A April 4, 1968, photo of police in riot gear is placed on a easel, in front of the present day scene that shows the Frank D. Reeves Municipal Center at 14th and U Streets in northwest Washington on March 28, 2018. in Washington, DC, is seen in the background as people cross at the intersection of 14th Street and U Street, NW in Washington, Wednesday, March 28, 2018. The April 4, 1968, assassination of Martin Luther King Jr. sparked rioting that began in Washington at this intersection. (File | AP)