NINE people were killed and 23 injured in a village in Nigeria's northeastern Yobe State that was hit by an airstrike by the Nigerian air force, which is battling Islamist insurgents in the area, the state's emergency response agency has announced. The air force said earlier it may have killed and injured civilians while pursuing insurgents in Yobe and that it was investigating the incident. Earlier, an air force spokesman said a fighter jet responded to intelligence on suspicious movements of suspected insurgents from either the Boko Haram group or ISWAP on Wednesday and fired "some probing shots", killing and…