Questions are mounting over a failed US rescue mission in Yemen that left two hostages dead.
The United States says it didn't know a South African charity had negotiated the release of teacher Pierre Korkie.
It also didn't know he was being held at the same compound as American photojournalist Luke Somers.
Korkie and Somers were shot by al-Qaeda militants, when abductors discovered US commandos were about 100-metres from the compound where they were being held.
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