`Stop Press` or `Stop the Presses` is a phrase stemming from the printed news media industry as an exclamation signifying the discovery of the need to change the content of an issue just before, or during its printing. Since this meant that the printing press literally had to be stopped or delayed and much of the existing copies of a publicati... Found on http://en.wikipedia.org/wiki/Stop_press
In newspapers, the latest available news just in. From a time when printing presses were stopped to put in urgent breaking news before continuing the print run. Papers often had Stop Press boxes in a corner of the front or back page where brief urgent stories could be inserted. Found on http://www.thenewsmanual.net/Resources/glossary.html