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 Pakistani schoolgirl, who was displaced with her family from Pakistan's tribal areas due to fighting between militants and the army, receives a polio vaccine from a health worker in the outskirts of Islamabad, Pakistan, January 31, 2013.

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Pakistani schoolgirls listen to their teacher, not seen, as a health worker visits their school to give them polio vaccines in the outskirts of Islamabad, Pakistan, January 31, 2013.

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Pakistani schoolchildren look for their shoes while other enter a classroom as a health worker visits their school to give polio vaccines, in a poor neighborhood on the outskirts of Islamabad, Pakistan, January 31, 2013.

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Pakistani relatives and mourners of a polio worker, who was killed in a roadside bomb, pray next to his body, in Parachinar, Pakistan, January 31, 2013.