Hidayat Khan says the bombing Monday occurred in Jamrud, the main town in the Khyber tribal area.
Khan says the bomb was placed in the women's waiting area at the office of the assistant political agent for Khyber, one of the top government officials in the area. Khan works in the office.
No group has claimed responsibility.
Several militant groups, including the Pakistani Taliban, have carried out repeated attacks in Khyber and other parts of the tribal region.
(Copyright 2012 by The Associated Press. All Rights Reserved.)