EXPLICIT CONTENT WARNING: This story and the above video contains graphic content.
Rapper Mos Def has staged a harrowing protest over the treatment of terrorism suspects in Guantanamo Bay.
The America hip-hop star, real name Yasiin Bey, agreed to undergo the procedure, which is being used on inmates currently undergoing a hunger strike in the controversial detention centre in Cuba.
Guantanamo Bay inmates are force-fed under only certain conditions: If they refuse nine successive meals or if their body weight drops significantly, they are offered a twice-daily can of a nutritional supplement.
If they refuse that, guards shackle them into the chair by their arms, head and feet, and a nurse inserts the tube up the nose, down the back of the throat and into the stomach.