Unknown armed men blew up a public school northwest Pakistan on Monday. Pakistani security sources confirmed that the blast, which targeted a primary school located at Charsadda city, caused no casualties because the school was empty at the time of the attack, but damaged the school's exteriors. Police have cordoned the area and conducted searches for the assailants. Similarly, a secondary school was hit in a blast in Badaber located at the Peshawar District yesterday. A number of schools were exposed to similar blast operations in the same area during the past few years.