They deserve some credit. The following is a contrived analogy, admittedly not a great one, to illustrate why I suspect they can't give specifics. Imagine if

They deserve some credit. The following is a contrived analogy, admittedly not a great one, to illustrate why I suspect they can't give specifics. Imagine if you have a gigantic elephant standing near a village. It's so big that you can only see one of the following, depending on where you stand: a trunk that can suck people up, legs that can smash, a tail that can create a wind that tosses people about. Three people are standing in different places to see each of these: Alice (trunk), Bob (legs), and Charlie (tail - poor Charlie). Someone comes running into the village and leaves an anonymous note saying a huge being is a threat and it is going to smash houses. Except the villagers, if they can figure out who was standing where and what they could see, can tell who left the anonymous note. It was Bob, who could see the legs. Giving the specifics they know about a threat reveals what they know, and what they don't know, and reveals how they might have gotten the information.