A view of the drain where Muammar Gaddafi was hiding before he was captured in Sirte October 21, 2011. The United Nations human rights office called on Friday for a full investigation into the death of Libyan leader Muammar Gaddafi and voiced concerns that he may have been executed. Images filmed on mobile phones before and after Gaddafi's death showed him wounded and bloodied but clearly alive after his capture in his hometown of Sirte on Thursday, and then dead amidst a jostling crowd of anti-Gaddafi fighters. REUTERS/Esam Al-Fetori (LIBYA - Tags: POLITICS CIVIL UNREST CONFLICT)