It's hard to see the benefit of this kind of information getting out to the public, but then again I'm not exactly Lt. Kojak, so I don't know. It just makes me nervous it'll tip off the wrong people and thwart the investigation. I hope you're right that this was intentional.
They may be trying to make the suspects nervous, so that they will make a mistake. The real truth may be that the FBI doesn't really have enough to make an arrest (or be sure of a conviction).