Gunmen kill a policeman guarding polio workers in northwestern Pakistan

Police say a pair of gunmen on a motorcycle opened fire and killed a policeman guarding a group of polio workers going door-to-door in a vaccination campaign in northwestern Pakistan. Thursday's attack took place in Bannu, a district in the restive Khyber Pakhtunkhwa province. The policeman who was gunned down was standing on a street corner and the attackers fled the scene, Khan said. In a similar attack on Wednesday in Bajur, also in Khyber Pakhtunkhwa province, a group of gunmen killed two people, a polio worker and a police escort. No one claimed responsibility for the two attacks, which have raised fears among polio workers. Authorities launched a new nationwide polio vaccination campaign on Monday.