. A police officer fires tear gas as they clash with activists of Bangladesh Nationalist Party during a strike in Dhaka on December 13, 2012. Bangladesh\'s opposition alliance, led by former Prime Minister Begum Khaleda Zia, called for an eight-hours nationwide strike, two days after another violent strike, to press home its demand for immediate release of its acting secretary general Mirza Fakhrul Islam Alamgir and in protest against the killings and arrests of opposition activists during their Sunday\'s road blockade program, local media reported.  REUTERS/Andrew Biraj
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