A roadside bomb killed two polio vaccination workers in Pakistan's northwestern tribal region, where several attacks on such workers have taken place in the past two months.
Attack on Polio Workers in Pakistan Kills Two
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Nishat gives polio vaccine drops to a girl in Lahore, Pakistan, December 20, 2012.
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A girl shows a finger marked after being immunized in Lahore, Pakistan, December 19, 2012.