Sources confirmed that the device was planted in front of the home of Muhammad Gul, a Union Council Polio Worker (UCPW).
The bomb went off near the house of the polio vaccinator Mohammad Gul who was out walking with his brother, also a polio worker, and his cousin, although it was not clear whether they were specifically targeted.
"Two polio workers and their cousin were killed in the bomb blast," local government official Khushhal Khan told AFP.
A local security official also confirmed the bombing and casualties.
Police cordoned off the site of the blast and a search operation is underway. However, no suspect has been arrested yet.
In a separate incident, a Levy official was killed by unidentified gunmen in Ghazi Kor Kandao, Ghallanai. This is the third target killing incident that has taken place in Ghallanai in the past week.
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