Bahraini anti-government protesters, one carrying a national flag, react to tear gas fired by riot police Saturday, April 21, 2012, in Diraz, Bahrain, west of the capital of Manama. Bahraini ... more 
Bahraini anti-government protesters, one carrying a national flag, react to tear gas fired by riot police Saturday, April 21, 2012, in Diraz, Bahrain, west of the capital of Manama. Bahraini opposition groups claimed Saturday that a man was killed during clashes with security forces, threatening to sharply escalate the Gulf nation's unrest as officials struggle under the world's spotlight as hosts of the Formula One Grand Prix. Authorities opened an investigation in a bid to diffuse tensions. (AP Photo/Hasan Jamali) less 
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Associated Press | Photo By Hasan Jamali
Sat, Apr 21, 2012 3:11 PM EDT