Here are two different websites that offer the same news articles at different levels of difficulty:
The Newsela website provides different versions of the same news articles at different levels of text complexity. It includes comprehension quizzes for each article.
The Newsela website is available at http://newsela.com
Read reviews of this resource at http://larryferlazzo.edublogs.org/2013/06/18/newsela-provides-leveled-news-articles-quizzes and at http://cristinaskybox.blogspot.com/2013/06/the-relevance-of-reading-skills.html
The News in Levels website writes summaries of the same news articles at three different levels of difficulty. Students can stick with one level that matches their proficiency, or they can read increasingly more difficult versions of the same article as they become more familiar with its content.
The website is available at http://www.newsinlevels.com
Read some suggestions for use by teachers at http://www.newsinlevels.com/for-teachers2