BAJAUR: An explosion in a girls' school razed the building to ground in Bajaur tribal agency on Saturday.Miscreants had planted explosives at various spots in government girls' middle school building in Tangi area of Sallarzai tehsil in Bajaur tribal region, sources said. The building crumbled to ground as explosives went off with loud blast that rocked the area. No loss of life reported in the incident, sources added.