BBC NEWS | South Asia | Bomb kills polio health official: "A senior health official has been killed and three guards injured in a bomb blast in Pakistan's tribal region bordering Afghanistan, officials say.
The dead man, Abdul Ghani Khan, played a key role in a polio immunisation drive in the Bajaur tribal region.
Dr Khan was returning from a meeting of tribal elders to persuade them to end their opposition to the campaign.
It is not clear if he was targeted because of his work to eradicate polio in the area.
No one has admitted to carrying out the blast. Officials said the assailants used a remote-controlled bomb."