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Kerry vows 'to leave no stone unturned' on Benghazi

A picture shows a burnt car at the US consulate compound in Benghazi on September 13, 2012, following an attack on the building in which the US ambassador to Libya, Chris Stevens, and three other US nationals were killed.US Secretary of State John Kerry on Thursday vowed to "leave no stone unturned" to find out what happened during an attack on a US mission in Libya last year in which four diplomatic staff were killed.