Islamic State is believed to have tortured two boys for breaking their fast during Ramadan and eating during the day without any religious justification.
After the caricature exhibition in Texas caused a shootout by religious extremists, the Senate and the Vatican condemned those who organized the event.
IS leader Abu Bakar Al Baghdadi and Taliban chief Mullah Mohammad Omar declared jihad against each other after the former called the latter a foolish, illiterate warlord.