Cooperating with the Government
Two inmates in Arizona had a two week long prison standoff and held two guards captive. This was  the longest standoff in recent history, and it was carried out in a guard tower with hand made weapons. The media agreed not to release any names or information about the standoff until after it ended.

Personally, I think that the media should have released more information about the event while it was going on. Their intention is to report the truth and minimize harm. I think there is much more harm in keeping the general public in the dark than releasing the names. If it becomes acceptable for the government to hold back information, it will trivialize the purpose of having news outlets. Preventing the general public from knowing key pieces of information about a subject only leads to corruption and infringes on the first amendment right to freedom of press.