A policeman searches a vehicle at a checkpoint in Baghdad

 
A policeman searches a vehicle at a checkpoint in Baghdad
A policeman searches a vehicle at a checkpoint in Baghdad's Abu Nawas street May 23, 2012. Wednesday's meeting between Iran and six world powers - the United States, Russia, China, Germany, France and Britain - will be the second since diplomacy resumed in mid-April in Istanbul after a 15-month hiatus that saw tensions soar. REUTERS/Saad Shalash (IRAQ - Tags: CONFLICT MILITARY)