DPO Mardan Faisal Shahzad said the bomber’s suicide vest exploded as he moved close to his target, SHO Ashiq Hussain's vehicle.
Eye witnesses, however, said an explosion took place after a few gunshots were fired.
According to SSP Operations Saifullah Khan, the bomber was wearing a suicide vest with 5kg of of explosive material.
1 killed, 17 injured in suicide blast at Mardan Excise and Taxation Dept
Another bomb attached to a motorcycle was later defused by the BDS, said an official.
While the police cordoned the area, investigation was initiated.
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