Unknown miscreants blew up a government primary school with a time bomb here on Monday. According to police, miscreants had planted a time bomb outside a government school in village Darra of Swabi district, which exploded with a bang. The school building was destroyed due the blast while window panes of a surrounding house also smashed owing to the intensity of the blast. However, no causality or injury was reported as no person was living in the building at the time of the blast. The police cordoned off the area after the explosion and launched a search operation with no arrest.