Week-long campaign to vaccinate 24 million children against polio begins

* Campaign is being held in 91 districts of Sindh, Punjab, Khyber Pakhtunkhwa, Balochistan and Islamabad
* 1,400 cops deployed to protect polio teams
* Polio vaccinators and security teams guarding them have often been attacked by militant groups
* CM Murad launches week-long anti-polio drive in Sindh