Isis extremist appeared to acquire been under extremely tight surveillance,but those details are unlikely to be made publicConfirming a “kill” in a targeted attack by plane or drone in hostile territory is done in the first instance by monitoring communications – mobile phones, radio etc – in the area of operations. The optimal and foolproof method of confirmation is to catch a DNA sample of the victim’s remains and check it against material obtained from relatives. But that depends on access on the ground, or which is unlikely in Raqqa,capital of the Islamic State.
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Source: theguardian.com