Protesters shield themselves from tear gas fired by riot police during a May Day demonstration in Istanbul May 1, 2014. Turkish police fired water cannon and tear gas on Thursday to prevent hundreds ... more 
Protesters shield themselves from tear gas fired by riot police during a May Day demonstration in Istanbul May 1, 2014. Turkish police fired water cannon and tear gas on Thursday to prevent hundreds of protesters from defying a ban on May Day rallies and reaching Istanbul's central Taksim Square, the focal point of weeks of protests last summer. REUTERS/Umit Bektas (TURKEY - Tags: POLITICS CIVIL UNREST) less 
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Reuters | Photo By UMIT BEKTAS / REUTERS
Thu, May 1, 2014 4:33 AM EDT