So far the story is isolated only on the News of the World newspaper. If News Corp management failed to stop the practice there, who knows if it was done elsewhere? The Guardian:
A former senior News of the World journalist has gone public to corroborate claims that phone-hacking and other illegal reporting techniques were rife at the tabloid while the prime minister's media adviser, Andy Coulson, was deputy editor and then editor of the paper.
Paul McMullan, a former features executive and then member of the newspaper's investigations team, says that he personally commissioned private investigators to commit several hundred acts which could be regarded as unlawful, that use of illegal techniques was no secret at the paper, and that senior editors, including Coulson, were aware this was going on.
"How can Coulson possibly say he didn't know what was going on with the private investigators?" he asked.