Pakistani polio workers cross out an anti-polio campaign poster during a demonstration against the killing of their colleagues, in Islamabad, 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 ay after similar attacks across the country killed several female polio workers. (AP Photo/Anjum Naveed)

Associated Press
Pakistani polio workers cross out an anti-polio campaign poster during a demonstration against the killing of their colleagues, in Islamabad, 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 ay after similar attacks across the country killed several female polio workers. (AP Photo/Anjum Naveed)
Pakistani polio workers cross out an anti-polio campaign poster during a demonstration against the killing of their colleagues, in Islamabad, 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 ay after similar attacks across the country killed several female polio workers. (AP Photo/Anjum Naveed)
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