Explaining about the incident, NTTPS officials informed that the incident happened while re-grouping the empty wagons.
The products will be manufactured both at Berhampur and Noida facilities of the company.
The numbers released by an Islamabad-based think tank were lower than the 147 attacks claimed by the outlawed Tehreek-i-Taliban Pakistan.
The incident came to light when the storekeeper found a heap of copper scrap missing from the open yard at the storeroom premises.
The attack took place near a fruit market in the town of Mingora, located in the district of Swat in Khyber Pakhtunkhwa province, according to senior local police officer Shafiullah Khan.