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GENEVA, Feb 4 (Reuters) - Islamic State militants are selling abducted Iraqi children at markets as sex slaves, and killing other youth, including by crucifixion or burying them alive, a United Nations watchdog said on Wednesday.

Iraqi boys aged under 18 are increasingly being used by the militant group as suicide bombers, bomb makers, informants or human shields to protect facilities against U.S.-led air strikes, the U.N. Committee on the Rights of the Child said.

"We are really deeply concerned at torture and murder of those children, especially those belonging to minorities, but not only from minorities," committee expert Renate Winter told a news briefing. "The scope of the problem is huge."

Children from the Yazidi sect or Christian communities, but also Shi'ites and Sunnis, have been victims, she said.