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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A policeman stands guard as Neila gives polio vaccine drops to a child at a Christian colony slum in Islamabad, Pakistan, December 20, 2012.
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A polio worker gives polio vaccine drops to a child in Lahore, Pakstian, December 20, 2012.
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A policeman accompanies polio workers during their anti-polio drive mission in Lahore, Pakistan, December 20, 2012.
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A health worker visits Lahore's slums to administer the polio vaccine to infants, Pakistan, December 19, 2012.