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Breaking news now on Fox News Channel one of the big questions in -- Boston bombing has now been answered.
Where did they build the bombs.
As it turns out sources tell our Catherine Herridge they've built and -- temporal and -- man's apartment.
Which means they built them in his wife's apartment.
Catherine Herridge in DC now -- this new she's -- this is intrusive.
Well -- was able to confer in the seeding shepherd that they're working theory or the belief at least of the investigators is that the bombs were constructed in -- And this brings us of course to the question.
Of the wife who has not been clear in this case who has provided DNA as we reported earlier this week female DNA was found on the bomb components.
And it also raises questions about what she sought in the apartment -- remember.
This scenario with the explosives has been described to fox as like a mini bomb making factory there we're not only.
Three IED's -- improvised explosive devices.
In the pressure cookers all of which were essentially effective.
But we learned this evening and that there were it at least four other different types of IED's or total -- -- I EDs in that apartment.
And -- almost all of these homegrown cases you only see typically one type or by ED so the question is.
If this was happening in the apartment.
What was she aware of was anything done on on on her behalf to aid them either knowingly or unknowingly -- -- you know I don't remember recovering one of these terror investigations of any kind.
Where we saw more than one kind of bomb I -- very isn't very important I was just gonna say normally you learn to make a bomb it takes a while the perfected.
You don't then -- to make -- -- -- to you stick with what you know.
So -- raises the question the obvious when Katherine.
It's very well this one district and need to interrupt -- that that this is one of the striking elements of -- -- and we focused in on this issue really from the get go here at fox.
Which is that there was the quantity of IED's improvised explosive devices and then also the quality.
Of the -- is virtually everything that this and I have Brothers are alleged to have made.
Was effective in this is highly unusual in these homegrown cases typically you see issue rightly point out.
Only one type of explosive device and in many cases these explosive devices fail because they don't have a lot of practice we saw that fortunately.
With Faisal Shahzad and the failed bombing of Times Square in the summer of 2010.
So this again goes to the idea that there was some sort of formal bomb making training.
And as we reported a studio -- this afternoon the detonation mechanism this radio controller from a toy car.
This is not typically seen.
In any appeal Qaeda manuals and it's not found in this manual called inspire magazine so in effect.
This is the kind of detonation mechanism that you see in overseas IED is not -- homegrown devices.
Very interest and Catherine thank you I mentioned there are -- -- of breaking news tonight that was one we have another bit of breaking news.
Why did they choose the Boston Marathon.
Now we know and that's next.
Breaking news on Fox News Channel why did the Boston bombers choose the Boston Marathon.
Catherine Herridge with -- new reporting live in Washington Catherine.
They -- -- national security source familiar with the Boston investigation tells Fox News.
-- -- certain diet has told investigators that the bonds came together more quickly than expected with the Brothers deciding to target the Boston Marathon.
National security source described the marathon is a quote target of opportunity.
Without adding any further comment Fox News is also told the planning for the attack showed quote clear premeditation.
Including the decision -- to target the finish line.
So it didn't have anything to do with.
Patriots day here or anything else.
No it was a large event high number of civilians.
And it presented them with an opportunity when the bombs were ready shepherd.
There was there was there was so many questions in the early going -- -- that date and that time of year being so significant on the calendar.
And now we note that wasn't the case at all they had the bombs ready so they went out.
-- a target of opportunity and more specifically there was clear premeditation and the decisions target the finish line.
Was one based on my experience where they -- they've had the highest concentration.
Of civilians and they -- as an easy opportunity to drop devices because there were so many packages in the area shepherd.
And they had bombs left over and that's why they were talking about going to Times Square kind of on the fly.
Well it was seen it would seem on the -- but what's more concerning again is the quantity and the quality.
Of the IED's that they were able to put together and as we -- this evening.
Investigators believe it all happened in -- -- apartments.
-- any thinking on whether there are others of similar mind I'm sure that something into which investigators are looking.
This is where the -- of the electronics comes in fox confirmed that the electronics the computers are being reviewed by the FBI.
And that prior to the Boston bombing attacks the Brothers had not cleared the hard drives which will be very valuable to investigator -- for Catherine Herridge who works intelligence for us thank you Catherine is always.
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