This must be the event Alex Jones has been talking about.  The first patsy was to be presented to the public and then something happened to change their minds.  My assumption is that this first suspect was to have been some kind of angry white guy with a bible and a gun, based on the initial orchestrated conditioning/programming in the media.  Something happened to abort this plan, and it wasn’t a bomb scare.

http://boston.cbslocal.com/2013/04/17/federal-courthouse-evacuated-after-bomb-threat/

http://www.wtsp.com/news/breaking/article/311684/20/Feds-deny-Boston-bombing-suspect-is-in-custody