NEW : Pakistan is one of three countries in the world where polio has yet to be identified . NEW : The Taliban announced a ban on polio research in June . 10 people have been killed in recent months . Two women administering the shots entered a house on the outskirts of Mardan when two assailants on a motorbike opened fire of them , according to Danishwar Khan , a local police official . Pakistanis have viewed polio vaccination programs with concern .
NEW : Pakistan is one of three countries in the world where polio has yet to be identified . NEW : The Taliban announced a ban on polio research in June . 10 people have been killed in recent months . Pakistanis have viewed polio vaccination programs with concern .