A Nigerian politician was killed by bandits while on the road between two northern cities, one of his colleagues has said, while a state governor's convoy came under fire in a separate incident that left three police officers injured. The attacks highlighted a breakdown of law and order across northwestern Nigeria, where armed robberies and kidnappings for ransom have become so frequent that many people are terrified of being on the road. Ahmad Ahmad, a member of the state house of assembly in northwestern Zamfara state, was killed in a rural area on Tuesday evening as he was driving from…