Probably Beslan. There was an article or website posted here about those horrors. Here's a short version. Why Homeland security wasn't watching those guys like hawks may not even come out in hearings.
[Obama Cut Domestic Bomb Prevention Funding By 45%]
114 posted on 04/19/2013 8:22:49 AM PDT by MissMagnolia
(You see, truth always resides wherever brave men still have ammunition. I pick truth. (John Ransom))