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Photo by: Hassan Ammar

Bahraini riot police seen near the Pearl roundabout during clashes with anti government protesters, in Manama, Bahrain, early Thursday morning, Feb. 17, 2011. Some protesters appeared unbowed as armed patrols prowled neighborhoods and tanks appeared in the streets for the first time Thursday after riot police with tear gas and clubs drove protesters from a main square where they had demanded sweeping political change in this tiny kingdom. Medical officials said four people were killed. (AP Photo/Hassan Ammar)

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