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Vietnamese photojournalist Nick Ut reflects on "Napalm Girl," his harrowing 1972 war image that came to symbolise the horrors of an intractable global conflict. He is retiring after 51 years with the Associated Press, covering everything from the Vietnam War to Hollywood celebrities.

Warning: Contains some disturbing images.

(Photo: Nine-year-old Phan Thị Kim Phúc (centre), flees from Trang Bang village outside Saigon after a napalm attack on June 8, 1972. The photojournalist who took the picture, Nick Ut, went on to win a Pulitzer Prize for the image. Credit: Nick Ut/Associated Press.)