Unknown culprits launched a missile attack on the office of a religious group at Tehsil Bara in Khyber Agency here on Monday which caused seven people to die while two others were injure The attack has demolished the infrastructure of the building.However, the chief of the group and other commanders escaped unharmed of the attack meanwhile, the locals and the volunteers have been engaged to dig out people from debris. The attack triggered violence in the region while the political administration has started probing into the matter.