Sometimes the wire services will keep the same URL but change the text in the story and even the headline as more facts become available.
I had this happen to me a few years ago on a story I submitted about Fedex misplacing some radioactive rods.
http://news.slashdot.org/story/10/11/26/1948245/FedEx-Misplaces-Radioactive-Rods
By the time the story was posted the rods had been found and the linked story was a non-story with a new headline:
"FedEx Finds Radioactive Shipment That Vanished Between N.D. and Tenn."
Some newspapers like the NY Times will post a correction at the bottom of the story whenever something changes in the story.
Many don't.
Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true. -- Bertrand Russell