Iraqis walk through Tahrir Square during a heavy sandstorm in Baghdad, Iraq, 

Iraqis walk through Tahrir 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/Hadi Mizban)
Associated Press
Iraqis walk through Tahrir 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/Hadi Mizban)
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