US marks 40 years since Martin Luther King killing
The United States is today marking the 40th anniversary of the assassination of civil rights leader Martin Luther King.
The 39-year-old was shot dead as he stood on the balcony of the Lorraine motel in Memphis on April 4th, 1968.
His killing triggered race riots in dozens of US cities.
The motel where it occurred has since been transformed into a National Civil Rights Museum.