The gunmen used the exhaust pipe of a motorcycle to identify them in case they escaped.

They took each child and put their leg in front of the exhaust pipe, which caused a burn mark,their relatives said.

Yaniv Yaakov, the uncle of brothers Or, 16, and Yagil, 12, who were freed in a prisoner exchange deal, said: “It meant that if a child fled, they could find them.”

He added: "They were drugged, they were treated so badly, but at least they are still with us.”

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