It isn't uncommon for conflicts to arise between the news media and law enforcement agencies over the release of information.
Police are protective of their investigations and worry about showing too much of their hand. News reporters are hard-core advocates of the public's right to know and question anything that stands in the way of gathering information freely. As standoffish as the two groups can sometimes be, there's also a reliance on each other. There are times one can benefit from the other.