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Fox News alert new details about how the marathon bombs were detonated that could change this investigation.
Brand new hour here of America live welcome everyone I'm Megyn Kelly.
Sources are now telling Fox News that the bombs used to kill three people and injure about 200.
Were detonated by someone who was with in the line of sight meaning they had to see the bombs being detonated.
And because of that investigators are not ruling out the possibility.
That a third person may have been may have been involved.
In this attack.
Our chief intelligence correspondent Catherine Herridge is breaking this news she is back with us now live in Washington Catherine.
Well thank you -- the national security source who spoke to Fox News on the condition of anonymity.
Because they're not authorized to speak on the record about the investigation confirms.
The bombs did not rely -- cellphone detonators but rather what's called line of sight with the speed controller as a trigger.
As fox is -- first to report based on an FBI and homeland security intelligence bulletin.
The bombs likely relied on components of remote control toy cars while the range of the to a car components in Boston is not public it is typically 250 yards or less.
Significantly the national security source also confirmed.
That remote control parts are not part of inspire magazine the al-Qaeda web magazine which includes -- how to guide to build bombs.
While the working theory is that one or both of the Brothers triggered the detonation using -- -- controllers Fox -- -- told a third party in the crowd has not been ruled out.
Though there's no evidence suggesting a third party at this time.
The FBI is reviewing or what they call exploiting the Brothers computers for potential domestic contacts in the plot -- it.
While and that as a -- very interesting that that's not an inspire magazine and and got -- extremely.
Because the early information that was leaked about these devices is that they had somehow clean the information.
From reading inspire magazine which is propaganda magazine put out by al-Qaeda.
In Yemen about how to make your own explosives.
But fox is able to confirm earlier today that none of the inspire magazines.
Include instructions that use these remote control toy cars this means.
That it was not something inspired by that magazine but it came from elsewhere right where did they get and that Caroline is a college.
So how did they figure that out how did they figure out headed headed detonate these without using inspire.
Who who -- if anyone -- them and it's yet another thing you're gonna need to look into including that -- and trip to Russia and who we met with there.
Well the FBI is very active.
-- reconstructing the six months in Russia.
And with former members of the joint terrorism task force in New York until Fox News.
Is that -- just on the face of it when you look at the quantity of explosives they were able to produce.
And also the fact that they were effective.
And they didn't seem to have any accidents in the process this again speaks the idea that there was some kind of formal or person to person bomb making training.
While Catherine thank you very much you're welcome.
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