Well, they weren't under FBI watch immediately before the bombing, right? The older brother was interviewed two years ago, and he fell off the radar.
The bombs were made of relatively ordinary household items, so the whole "planning and building" thing is pretty easy to do surreptitiously.
And, the way they handled themselves after their pictures were spread indicates to me that they were pretty amateur; i.e. not too involved in any terrorist group.
I'm not saying that we have all of the facts (I'm pretty convinced that we don't, and never will), but I don't see too many inconsistencies in the story so far.
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