A policeman who was providing security to a polio team is killed , police say . Militants have targeted anti-polio campaigns in Pakistan since U.S. intelligence officials used a fake vaccination program to help in their hunt for Osama bin Laden in 2011 . Unknown gunmen also kill a health worker in the Agency , a local newspaper says . Polio clinics have come under increasing attack in Pakistan in the past year .
A policeman who was providing security to a polio team is killed , police say . Unknown gunmen also kill a health worker in the Agency , a local newspaper says . Polio clinics have come under increasing attack in Pakistan in the past year .