Isis in Iraq - and to a lesser degree Syria - depends on the co-operation of certain tribes who are against the governments in Damascus and Baghdad.
The family of the Jordanian pilot appealed to Isis on a tribal basis to spare their son and for the militants to have rejected that so viscerally and so viciously, I think will inevitably backfire.
The so-called Arab man on the street will simply not be able to comprehend this.
Rageh Omaar explains the impact of Muath al-Kasaesbeh's murder:
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