A Pakistani injured polio worker is treated at a local hospital in Peshawar, Pakistan, Wednesday, Dec. 19, 2012. Gunmen shot dead a woman working on U.N.-backed polio vaccination efforts and her driver in northwestern Pakistan, officials said, just a day after similar attacks across the country killed several female polio workers. (AP Photo/Mohammad Sajjad)

Associated Press
A Pakistani injured polio worker is treated at a local hospital in Peshawar, Pakistan, Wednesday, Dec. 19, 2012. Gunmen shot dead a woman working on U.N.-backed polio vaccination efforts and her driver in northwestern Pakistan, officials said, just a day after similar attacks across the country killed several female polio workers. (AP Photo/Mohammad Sajjad)
A Pakistani injured polio worker is treated at a local hospital in Peshawar, Pakistan, Wednesday, Dec. 19, 2012. Gunmen shot dead a woman working on U.N.-backed polio vaccination efforts and her driver in northwestern Pakistan, officials said, just a day after similar attacks across the country killed several female polio workers. (AP Photo/Mohammad Sajjad)
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