In general, you should go to news databases to search for news content. Library Search is not a good bet for finding news, especially recent news, although it will have some news articles integrated into search results.
For very recent news and up-to-the-minute headlines, you are probably better off using Google News or a similar news aggregator. There will always be at least some minor delay with news getting indexed in library databases.
See the News Sources research guide for more detail, including information on finding local and historical news.