(CNN) — A proud father’s boast accompanies an image the U.S. secretary of state on Tuesday called “one of the most disturbing, stomach-turning, grotesque photographs ever.”

“That’s my boy,” Khaled Sharrouf wrote on Twitter alongside a photo of his 7-year-old son using both hands to hold up a man’s severed head.

The photo, since removed from Twitter, was reportedly taken in Raqqa, a Syrian city in the stranglehold of Islamic militants, where the Australian father has taken his young family to join the fight.

Condemnation has been swift and on Tuesday included scathing criticism from Australia’s most senior Islamic cleric, Grand Mufti Ibrahim Abu Mohamed.

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