Unknown assailants shot dead a polio worker in Bannu district in Khyber Pakhtunkhwa on Wednesday, police said.

Cantt police identified the deceased as Rafidullah, a former supervisor of the polio campaign in Bannu.

An in-charge of Cantt police station confirmed the firing incident, saying that Rafidullah was apparently headed to the local bazaar when unidentified gunmen opened fire at him, gravely injuring the victim.

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Soon after the firing, police reached the spot and shifted the injured to a hospital, where doctors pronounced him dead.

“We have started an investigation into the killing but so far the motive behind the killing is unclear,” he informed, adding that the dead body has been sent for a postmortem examination.