The two attackers fired shots from a nearby mountain on the van in Shalman area of Khyber region where the military is battling militants.
"The two-member team was busy making preparations for the three-day polio campaign starting in the region from Monday when the two gunmen opened fire on their vehicle killing its driver on the spot," a senior local administration official Tayyab Abdullah told AFP.
The polio workers, however, escaped unhurt.
A senior health official of the district, Dr Muhammad Qasim also confirmed the incident.
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