AdvertisementGunmen In Pakistan Target Polio Vaccinators03:23Download AudioResumeDecember 19, 2012Dina Temple-RastonfacebookEmailRukhsana Bibi (center) mourns for her daughter, polio worker Madiha Bibi, killed by unknown gunmen, at a local hospital in Karachi on Tuesday. Gunmen staged additional attacks Wednesday. (AP)