The April 1968 Washington, D.C., riots, in the aftermath of the assassination of Martin Luther King Jr., were the most devastating to the city. The roughly 20,000 rioters quickly overwhelmed the 3,100 member police department. During the four days of violence, the inner part of Washington was devastated in widespread looting and fires, at one point coming within two blocks of the White House. The rioting ended when 11,850 Federal troops and 1,750 D.C. Army National Guardsmen were called out to assist the overwhelmed MPD. 13 people were killed, 1,098 were injured, and over 6,100 were arrested. The resulting economic fallout and crime spike would take many areas decades to recover from. The mobilization of 13,600 troops to assist the MPD in putting down the riot was the largest military occupation of an American city since the Civil War.