Since May, there have been complaints in the Google Web Search Help forum about Google News not sticking with the search query you entered after clicking on the "all x articles" link on a search result.
You can replicate this yourself by following these steps:
1. Go to Google News 2. Search for anything 3. Find "aggregated" item and click on "all x articles"
You will then notice the search box is blank.
Here is a short screencast demonstrating this:
The first report didn't really specify Google News, so Googlers didn't understand it, nor did I. But this makes sense.