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U.S. Secretary of State John Kerry speaks to the media with Turkish Foreign Minister Ahmet Davutoglu and Syrian opposition leader Moaz al-Khatib, unseen, after a "Friends of Syria" group meeting at the Adile Sultan Palace early Sunday, April 21, 2013, in Istanbul, Turkey. The United States said Sunday that it will double its non-lethal assistance to Syria's opposition as the rebels' top supporters vowed to enhance and expand their backing of the two-year battle to oust President Bashar Assad's regime. (AP Photo)

Associated Press
U.S. Secretary of State John Kerry speaks to the media with Turkish Foreign Minister Ahmet Davutoglu and Syrian opposition leader Moaz al-Khatib, unseen, after a "Friends of Syria" group meeting at the Adile Sultan Palace early Sunday, April 21, 2013, in Istanbul, Turkey. The United States said Sunday that it will double its non-lethal assistance to Syria's opposition as the rebels' top supporters vowed to enhance and expand their backing of the two-year battle to oust President Bashar Assad's regime. (AP Photo)
U.S. Secretary of State John Kerry speaks to the media with Turkish Foreign Minister Ahmet Davutoglu and Syrian opposition leader Moaz al-Khatib, unseen, after a "Friends of Syria" group meeting at the Adile Sultan Palace early Sunday, April 21, 2013, in Istanbul, Turkey. The United States said Sunday that it will double its non-lethal assistance to Syria's opposition as the rebels' top supporters vowed to enhance and expand their backing of the two-year battle to oust President Bashar Assad's regime. (AP Photo)
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