Media reports had suggested the trip would begin as soon as Sunday and last two days
Opposition to inoculations grew after the CIA organised a fake vaccination drive to help track down Al Qaeda's former leader Osama Bin Laden in the Pakistani city of Abbottabad.
"It was an IED (improvised explosive device) explosion in which one of our policemen got martyred while two others were wounded", Mehmood told AFP.
Sadaqat Khan, a local police official, confirmed the toll.
There was no immediate claim of responsibility, but the Pakistani Taliban and other militants have targeted polio vaccinators in the past.
The nationwide polio vaccination campaign aims to vaccinate some 39 million children.
Tuesday's attack follows a devastating year in Pakistan's long fight against polio, with at least 17 cases reported in 2020 so far.
In 2019, the number of polio cases jumped to 144 from just 12 in 2018.
Even as Pakistan has tried to eliminate polio, a new challenge has emerged in the form of a growing global movement against vaccinations.
The phenomenon has attracted adherents worldwide, fuelled by medically baseless claims and proliferated on social media resulting in a resurgence of once-eradicated, highly contagious diseases.
Media reports had suggested the trip would begin as soon as Sunday and last two days
Visitors can enjoy movies with family favourites, including ‘The Jungle Book’, ‘Jumanji’ and ‘Zootopia’ to match the wild theme every evening from 8pm
Sheikh Mohamed conveyed his congratulations to all eight honourees, recognising their inspiring efforts and significant contributions in service to society
His father thanked everyone who participated in the search mission despite the challenges posed by flooding in various parts of the emirate
It will be humid by night and Sunday morning with a probability of mist formation over some coastal and internal areas
Nearly 6,000 volunteers linked to a single support group are working tirelessly across the country to help those affected
Real estate developer MAG pledges to cover all the costs of necessary repairs for affected residents
The substantial increase in charges left many residents financially burdened, as they strive to retrieve their stranded vehicles