Boxing legend Muhammad Ali has died aged 74.
Tributes have flooded in for the three-times heavyweight champion of the world, who was born Cassius Clay in 1942. Ali, died on Friday (June 3) in hospital in Arizona.
In August 1966, Muhammad Ali was in Britain for a title bout against Blackpool-born boxer Brian London.
But he took time out of his busy training schedule to visit the film set of the movie The Dirty Dozen.
The MGM blockbuster was filmed on location throughout the area, including Ashridge Park, Chenies in Buckinghamshire, Hendon Aerodrome and Aldbury, Markyate and Borehamwood in Hertfordshire.
These rare images show Mohammad Ali chatting on set.
They include him chatting to actor Jim Brown who played Robert Jefferson in the film. The images are taken from our Mirrorpix archive.
Muhammad Ali's funeral is expected to take place in his home town of Louisville, Kentucky.