An example of how LE handles something they don't want to make public:
Actual verbatim quote from a case, "We have not named anyone a POI or suspect in this case. We continue to follow all leads and at this time have no evidence to indicate this is anything but an isolated incident."
Hidden meaning: note the word "named." In this case LE did have their suspect (a husband who killed his wife but was not arrested for a few more months), but they weren't "naming" him publicly. It wasn't until he was arrested that there was a followup press conference.