Many of them were barely school age when their parents took them to the Islamic State group's so-called caliphate in Iraq and Syria. Thousands of others were born there.

The children of the group's followers are the most vulnerable of the Islamic State's human leftovers — the remainders of the more than 40,000 foreign fighters and their families who came from 80 countries to help build the caliphate. Many are now detained in camps and prisons across eastern Syria, Iraq and Libya.

"What have these kids done?" said Fabrizio Carboni, a Red Cross official, after witnessing the misery surrounding him

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