Gunmen in northwest Pakistan killed five teachers and two aid workers from a non-governmental organization Tuesday as they were driving home from work. The group's director said they may have been targeted for their anti-polio work.
Militants in the past have accused health workers of acting as spies for the U.S., alleging the vaccine is intended to make Muslim children sterile. Last month, nine people working on an anti-polio vaccination campaign were shot and killed. Four of those shootings were in the northwest where Tuesday's attack took place. (AP)