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Fox News learning right now that the FBI is investigating whether anyone else is involved in this whole thing.
A senior source on Capitol Hill who has been briefed by the National Counterterrorism Center.
Telling us it is quote.
Really important that we try to take this guy alive.
So agents can ask questions and figure out whether more people are involved in this they do not know whether this -- has been limited to these two Brothers.
The source saying that the FBI is investigating whether these two went overseas one or both of them.
And whether one or both of them were potentially radicalized.
In the United States since arriving.
As much as a decade ago at a -- it appears they came into the country -- -- in two different years.
They are looking into their travel history they are tracking passports airline tickets and other data.
Ourselves a source also saying that officials know the two suspects are Muslim.
And are trying to find out whether they attended a mosque in the area again this is from a source who has been briefed.
By the National Counterterrorism Center these are all leads that they are trying to track down right now including the most significant when I mention there witches.
Is anyone else involved saying it is hard to believe they did this without help.
Or training and perhaps training overseas.
And Megan from that same source on Capitol Hill we also know that these two suspects posted videos online and quote espoused to sympathy for al-Qaeda.
Let's take a look at what else we know about these Brothers and their backgrounds and as we do that remember this picture.
The suspect police are tracking down at this very moment coming within a few steps of the little eight year old boy.
Who was killed in the attack the spot shadow there highlighting nineteen year old Joseph Carr or Joseph Carr -- -- have.
And just to the left of the -- box there the little eight year old victim.
Of the bombing Trace Gallagher is live in our West Coast newsroom for us now -- We know John the family says the Brothers have -- the United States now for the better part of a decade they lived together just outside of Boston they both came from Dagestan which is the Russian region.
Near Chechnya that has also been plagued by Islamic insurgents in recent years because of course of the separatist wars both attended very prestigious schools public schools.
In the Boston area we know that 26 year old cameramen so -- -- who was killed in a shootout with police earlier this morning.
Had a YouTube channel with the terrorist play list that included bloody videos and messages about all -- and martyrdom.
Also on Amazon.com.
Account -- he ordered books on Chechen separatists and the mafia.
Cameron was also involved in mixed martial arts he was a golden gloves boxer who won.
The Rocky Marciano award for best boxer in his weight class to -- -- starting out was also arrested in 2011 for assaulting his girlfriend it is unknown.
If they were still dating at the time now he was in rolled off and on.
In a community college he was said to be working odd jobs and AP is just now reporting.
That last year he traveled to Russia out of JFK.
And that he was gone for six months.
His nineteen year old brother Joseph Carr is a student at the University of Massachusetts Dartmouth his father who lives in Russia says Joseph Carr is a second year med student that has not been confirmed.
He wrestled in high school was said to be a star athlete and student.
Those who know him say he was well liked.
Very kind and they're very shocked to hear about this.
He has a page on the Russian equivalent of FaceBook where he says he is Muslim and that his personal goals are career and money.
His father called in the true Angel his uncle who lives in Maryland.
Was not nearly as kind -- -- -- -- -- Not being able to settle themselves.
-- -- -- -- And while the search goes on we continue learning more about these two Brothers what is still unknown at this point John is exactly how.
The younger brother.
Was able to escape.
As we get more.
We'll continue coverage.
And the search for him goes on that's what we are covering right now Trace Gallagher live in our West Coast newsroom thank you -- We are gonna have much much more right after this break with a woman who lived next door to these two boys and their family.
Four years week until you hear what she has to say about that -- and she has details on their parents that we have not yet heard.
As well she's live next as the manhunt continues.
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