The Pprune network is exceptionally extensive. It could just be that a contact or an incident, in the past, experienced by some of our colleagues, may be relevant to the horrendous tragedy in the US.
The FBI have set up an online form for people that may have such information. I suggest we bookmark it and make others aware of it. Perhaps Danny might like to think about a link in the opening page graphics?
http://www1.ifccfbi.gov/index.asp