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The truck was on its way to Swat, through the Nowshera-Mardan road, according to Deputy Superintendent of Police (DSP) Cantt Akhtar Ali.
Police officials have arrested two men after investigating the case.
Earlier this week, explosives were planted in a state-run all-boys school by unidentified militants. Since the first such attack on June 21, 2011, around 12 schools have been targeted in the region, with no militant group claiming responsibility.
The Khyber-Pakhtunkhwa region saw the deadliest attack this year when a suicide bomber killed 27 people and injured 55 in Mardan.
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