Seems to point to a "cell" of people with Jihadist ties, rather than two "lone wolves" who became "unhappy" with life is the US.
Hope, if this is true, these two brothers can unwittingly lead to a larger group of terrorists.
Also, maybe this awful act of terror might help wake up some of those who define "tolerance" as "justifying" everything anybody says and does as "good" and "right",
Well said