Withholding information is one thing (Senkaku incident), but I'd put silencing free press as another (that journalist didn't need any more info from the police to write the story. She simply isn't allowed to write period.)
Interesting how they're talking about a culprit who's acting in the physical realm for the ghost. I can't see any hints being dropped at all, but I do hope that it was secretly foreshadowed in some form. The worst case scenario would be some random who has no connection to the main characters whatsoever. The whole Nanase Miyuki murder incident was "out of the blue" enough as it is.