News is what's new.
An afternoon raid on a rock cocaine house may warrant a live ENG report at 6 p.m. However, tomorrow, unless there are major new developments, the same story will probably not be important enough to mention. If 15 people are killed in your hometown, your local TV station will undoubtedly consider it news. But if 15 people are killed in Manzanillo, Montserrat, Moyobambaor, or some other distant place you've never heard of, it will probably pass without notice. But there are exceptions.