The volunteers were killed Sunday in the Pakhtunkhwa . Vaccination programs have been targeted by Islamic State . Pakistan had 58 cases of infection in 2008 . The CIA used a fake vaccine program to verify bin Laden 's location .
The volunteers were killed Sunday in Khyber Pakhtunkhwa . Vaccination programs have been targeted by Islamic militants . Pakistan had 58 cases of polio in 2012 . The CIA used a fake vaccine program to verify bin Laden 's location .