“Health workers administering polio vaccinations to children came under attack in northern Pakistan on Tuesday, killing their police escort, authorities said,” CNN reports. “Two women administering the shots entered a house on the outskirts of Mardan when two assailants on a motorbike opened fire on them, according to Danishwar Khan, a local police official,” the news agency writes, noting, “The women were not injured” (Khan, 2/26). “No one immediately claimed responsibility for the attack. In December, gunmen killed nine polio workers in similar attacks across Pakistan,” according to the Associated Press (Khan, 2/26). “Along with Afghanistan and Nigeria, Pakistan is one of only three countries where polio is still endemic,” BBC News notes (2/26).