Traffic snakes through Kahramana Square during a heavy sandstorm in Baghdad, Iraq, Tuesday, May 22, 2012. The sandstorm prompted the shutdown of Baghdad's airport on Monday and brought travel complications for envoys trying to reach the Iraqi capital for nuclear talks between Iran and six world powers scheduled to begin Wednesday.(AP Photo/ Khalid Mohammed)

Associated Press
Traffic snakes through Kahramana Square during a heavy sandstorm in Baghdad, Iraq, Tuesday, May 22, 2012. The sandstorm prompted the shutdown of Baghdad's airport on Monday and brought travel complications for envoys trying to reach the Iraqi capital for nuclear talks between Iran and six world powers scheduled to begin Wednesday.(AP Photo/ Khalid Mohammed)
Traffic snakes through Kahramana Square during a heavy sandstorm in Baghdad, Iraq, Tuesday, May 22, 2012. The sandstorm prompted the shutdown of Baghdad's airport on Monday and brought travel complications for envoys trying to reach the Iraqi capital for nuclear talks between Iran and six world powers scheduled to begin Wednesday.(AP Photo/ Khalid Mohammed)
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