Pakistani health worker, Nooman Mehboob, 21, center, gives Ameeq Andriaz, 4, a polio vaccine, while other women holding their children wait to have them vaccinated, in a neighborhood in Islamabad, Pakistan, Monday, Nov. 25, 2013. On Saturday, militants kidnapped four school teachers who were working on a polio vaccination drive in Khyber's Sipah village, said local government official Khurshid Khan. Negotiations are underway for their release, he said. Militants have killed over a dozen polio workers and police protecting them over the last year. They claim the workers are spies and the vaccination is meant to make Muslim children sterile.