Pakistani activists rally in Karachi Pakistan to condemn killings of health workers, on Thursday, Dec. 20, 2012. Thousands of polio workers escorted by police guards pressed on with a vital immunization program in Pakistan’s second largest city Thursday despite the deaths of nine people gunned down by suspected militants while working on the campaign elsewhere in the country. Placard on top reads "save Pakistani children." (AP Photo/Fareed Khan)

Associated Press
Pakistani activists rally in Karachi Pakistan to condemn killings of health workers, on Thursday, Dec. 20, 2012. Thousands of polio workers escorted by police guards pressed on with a vital immunization program in Pakistan’s second largest city Thursday despite the deaths of nine people gunned down by suspected militants while working on the campaign elsewhere in the country. Placard on top reads "save Pakistani children." (AP Photo/Fareed Khan)
Pakistani activists rally in Karachi Pakistan to condemn killings of health workers, on Thursday, Dec. 20, 2012. Thousands of polio workers escorted by police guards pressed on with a vital immunization program in Pakistan’s second largest city Thursday despite the deaths of nine people gunned down by suspected militants while working on the campaign elsewhere in the country. Placard on top reads "save Pakistani children." (AP Photo/Fareed Khan)
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