(CBC) – The voice pledging jihad in the video is brash, prideful and chillingly juvenile. “We promise you car bombs and explosives,” the boy shouts, his small arms and hands gesturing wildly for emphasis. “We’ll destroy the enemies of the religions, all of them — all who fought the Islamic State,” he continues. “And the Caliphate?” prompts an adult male voice, coaching the youth off-camera. “And the Caliphate. The Caliphate will remain until the end of the world,” the child answers, reiterating his support for Abu Bakr al-Baghdadi, leader of Islamic State of Iraq and Syria (ISIS). The boy, who appears to be not much older than 12 in the Vice News documentary, embodies what human-rights and counter-terrorism researchers describe as a sophisticated and dangerous new phase for the Sunni extremists — the cultivation of child jihadis as part of a long-term strategy to building a caliphate, or Islamic state, in Iraq and Syria