Afghan president Hamid Karzai criticised the US over a claimed lack of co-operation with the probe of the alleged killing of 16 Afghans by a soldier.
Karzai said a team sent to investigate Sunday's shootings in south Afghanistan did not receive co-operation expected from US officials.
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The woman used her daughter's own Facebook page to live-stream the attack after the teenager posted provocative pictures online.
A senior employee at the organisation reportedly derided the three-year-old royal for being 'royal, rich' and "advantaged'.