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U.S. Secretary of State John Kerry (2nd R) walks across the tarmac of Baghdad International Airport with traveling staff as he prepares to board an aircraft out of the Iraqi capital March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry meets with Iraq's Prime Minister Nouri al-Maliki on March 24, 2013 in Baghdad. According to a U.S. official, Kerry will urge Prime Minister Nuri al-Maliki to make sure Iranian flights over Iraq do not carry arms and fighters to Syria. (Photo by Jason Reed - Pool/Getty Images) ( 164508895 )

U.S. Secretary of State John Kerry, right meets with Iraq's Prime Minister Nouri al-Maliki in Baghdad, Iraq, Sunday, March 24, 2013. U.S. Secretary of State John Kerry made an unannounced visit to Iraq on Sunday and will urge Prime Minister Nouri al-Maliki to make sure Iranian flights over Iraq do not carry arms and fighters to Syria, a U.S. official said. (AP Photo/Jason Reed, Pool) ( Mideast Iraq Kerry )

U.S. Secretary of State John Kerry, left, meets with Iraq's Parliament Speaker Osama al-Nujaifi, right, in Baghdad, Iraq, Sunday, March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and will urge al-Maliki to make sure Iranian flights over Iraq do not carry arms and fighters to Syria, a U.S. official said. (AP Photo/Jason Reed, Pool) ( Mideast Iraq Kerry )

U.S. Secretary of State John Kerry, second right, leaves after meeting with Iraq's Prime Minister Nouri al-Maliki, left, in Baghdad, Iraq, Sunday, March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and will urge al-Maliki to make sure Iranian flights over Iraq do not carry arms and fighters to Syria, a U.S. official said. (AP Photo/Jason Reed, Pool) ( Mideast Iraq Kerry )

U.S. Secretary of State John Kerry speaks to workers based at the U.S. Embassy in Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry (L) shakes hands with U.S. Marines based in Baghdad during his visit to the U.S. Embassy in Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry (C) poses for a picture with U.S. Marines based in Baghdad during his visit to the U.S. Embassy in Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry walks to his helicopter on the grounds of the U.S. Embassy in Baghdad Sunday, March 24, 2013, at the end of his visit to the Iraqi capital. Secretary of State John Kerry was in Iraq today, meeting with officials in an unannounced visit. He says he made it clear in talks with the Iraqi Prime Minister Nouri al-Maliki that the U.S. is unhappy with Iraq for letting Iran use its airspace to ship weapons and fighters to Syria. (AP Photo/Jason Reed, Pool) ( Mideast Iraq Kerry )

U.S. Secretary of State John Kerry straps himself into a helicopter as he prepares to fly out of the U.S. Embassy in Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry straps himself into the cockpit of an Air Force C-17 aircraft as he prepares to leave Baghdad following a short trip to the Iraqi capital, March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry (2nd R) steps off a helicopter as he prepares to board an aircraft to leave Iraq at Baghdad International Airport March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry (2nd R) walks across the tarmac of Baghdad International Airport as he prepares to board an aircraft out of the Iraqi capital March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry steps aboard an Air Force C-17 aircraft bound for Baghdad, in Amman March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and will urge Prime Minister Nuri al-Maliki to make sure Iranian flights over Iraq do not carry arms and fighters to Syria, a U.S. official said. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry speaks with Puneet Talwar (C), the National Security Council's Senior Director with responsibilities for Iran, Iraq, and the Gulf countries, and another advisor aboard an Air Force C-17 aircraft during their return to Amman from a trip to Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry (C) speaks to the media on an Air Force C-17 aircraft upon his return to Amman from a trip to Baghdad March 24, 2013. Kerry made an unannounced visit to Iraq on Sunday and said he told Prime Minister Nuri al-Maliki of his concern about Iranian flights over Iraq carrying arms to Syria. REUTERS/Jason Reed ( USA-IRAQ/KERRY )

U.S. Secretary of State John Kerry speaks with members of the U.S. Air Force 816 Expeditionary Airlift Squadron aboard a C-17 aircraft bound for Baghdad on March 24, 2013 in Amman, Jordan. Kerry is expected to urge Iraqi Prime Minister Nuri al-Maliki during his visit to ensure that Iranian flights over Iraq do not carry arms and fighters to Syria. (Photo by Jason Reed - Pool/Getty Images) ( 164509379 )