(Reuters) - Asif Ali Zardari, widower of slain opposition leader Benazir Bhutto and co-chairman of the ruling Pakistan People's Party, gestures during a news conference in Islamabad May 30, 2008. Pakistan has formally requested a U.N investigation into the assassination of former prime minister Benazir Bhutto, her widower said on Friday. REUTERS/Mian Khursheed

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