Armed men have killed three more people working on a polio vaccination campaign in Pakistan, officials said, as the nationwide drive against the crippling disease suffered a third day of bloodshed.<br />A female health worker and her driver were shot dead in Charsadda, near Peshawar, the main town of northwest Pakistan, police official Wajid Khan told AFP news agency on Wednesday. A second police officer confirmed the incident.<br />Another worker shot and critically wounded in an earlier attack on the outskirts of Peshawar also died, doctor Ahmad Saqlain of the city's Lady Reading Hospital said.<br />Al Jazeera's Imtiaz Tyab reports from Islamabad.
