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Steven Sotloff's mother pleads to IS: 'Free my son'

27 August 2014 Last updated at 20:26 BST

The mother of Steven Sotloff, a US journalist being held by Islamic State (IS) militants, has made an emotional video appeal for his release.

Shirley Sotloff addressed her plea directly to Abu Bakr al-Baghdadi, the leader of the militant group.