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Aerials this is brand new search.
Video that's coming in steps away from the nineteen year -- dorm room and the buildings where he attended class.
A spokeswoman for the US attorney's office says the Bureau of Alcohol, Tobacco, and Firearms.
Is that and explosives is taking the lead on this search.
But could not say what the authorities are looking for.
This is we -- learning new details about the suspect's original plot.
And where the bombs were made were gonna go back to those aerials in one moment and be joined by law enforcement.
Law enforcement official to talk about what they might be searching for but I -- to get first to our chief intelligence correspondent Catherine Herridge who is live in Washington with.
More on this case this afternoon -- Thank you -- -- a national security source familiar with the -- investigations says so Carson and I have has told investigators that the bonds came together more quickly than expected.
With the Brothers deciding to target the Boston Marathon the national security source described the marathon as a quote target of opportunity.
-- adding further comment box was told that the planning for the -- showed clear premeditation.
Including the decision by the Brothers to target the finish line.
Separately a source familiar with the investigation told fox the bonds are believed to have been built in terror elements are -- home in Cambridge Massachusetts.
This of course raises questions about his wife Kathryn Russell this mug shot is from rush shoplifting arrest in May of 2007.
And whether she in the baby were still living with Tara -- At the time of the alleged activity Fox News has also asked Russell's attorney to comment on reports that while she initially cooperated with authorities in the case.
She is now no longer cooperating.
And there was no immediate response from Russell's attorney.
She had conversations -- -- beforehand she lived with them she saw his change in attitude.
She's got some -- explaining to do or at least some very difficult questions answered.
Within the last -- the US attorney's office in Massachusetts confirming via Twitter.
That the search as you see there in Dartmouth Massachusetts are connected to the ongoing marathon bombing investigation.
While no explanation is being offered a lingering question.
Is whether the Brothers had some kind of test site for the homemade devices.
National security force a source confirmed to Fox News that the Brothers had assembled at least four different types of IED's are improvised explosive devices.
This is extremely significant all of them were affected and in these typical homegrown cases Megan.
You only see one kind of I ED construct.
Academy finally -- on these aerials that we're looking out of the search.
You have reported that date -- which retrieved the laptop that these three most recent suspects took from the rooms.
The room left of them.
Joseph cars are -- and that apple FBI affidavit seems to suggest they got.
The backpack and the contents thereof and so.
Do we believe that anything.
The three most recent defendants took from that Rome.
Is still missing.
Not based on the criminal.
Complaint the criminal complaint was very silently discuss this on your show yesterday as to what happened to that locked laptop computer.
Based on the reporting my belief is that the laptop was actually recovered from.
The apartment of those two concepts students and not from.
The landfill site because we were told on Tuesday the electronics.
-- in the possession of the FBI and we're being reviewed and so far they had not shown some of the classic markers of self radicalization.
At least for Chamberlain that this search -- in UMass Dartmouth that area.
Is very important.
Because when you build bombs you have to have a way typically.
To test them so you understand whether they're very stable or unstable in terms of transporting them.
And how they're going to behave because every kind of device.
Is a little bit different based on.
The working -- has always been the Brothers had to have some kind of test site.
And this may well be a -- in connection to it I'm hypothesized -- But that's one of the -- answer questions at least from the media's point of view the FBI may have a very good sense.
Of where that was done at such a.
Good point because we've talked before about how the Times Square underwear bomber.
And the -- in Times Square bomber and then the Detroit Christmas Day underwear bomber.
They managed to get explosive devices to their targets in the one guy in Times Square the other guy in the airplane but the bombs malfunctioned.
And so that would have made it you know one can assume even more important in the minds of these -- -- Brothers.
Make sure there wasn't a malfunction and may -- to do the kind of testing that.
Their train to do they read uninspired they should do I don't know how they learn that they're supposed to do it but clearly they knew -- lot more than bought about bomb making.
Than your average college student.
That that the take away with -- not bomb making is that the quantity of explosives.
And is fox was first to report last night.
The fact that there were four different types -- by TDs including the pressure cooker bonds all of this speaks to some kind of formal bomb making.
Training in typical homegrown cases there's only one style by EG Faisal Shahzad.
In Times Square the failed attempt with the car bomb.
That was a pressure cooker bomb in some other bombs but not this vast array and it was -- successful because what's been explained to me.
Is that learning how to make a -- it's like being surgeon.
You have to learn the basic skills but then you have to keep practicing -- and you have to be familiar.
With your material or you're going to have accidents and as far as the reporting is right now there were no accident since the cyanide Brothers had considering.
What they had in that apartment amounted to a mini bomb making factory in this again.
Speaks to experience and training with the explosives then.
It's chilling as you watch the overhead aerials and wonder what -- exactly they're looking for what sort of precursor of Fannie.
To the Boston Marathon bonding more and more -- or possibly just to jump in or possibly.
Other items that had been discarded that's that's also not clear because.
As we just as we discussed on your show Megan that criminal complaint does seem to leave the door open for further charges and -- very limited.
And it's -- and it comes you know just cup.
Two days after they'd -- took those.
Three guys into custody and charge them Catherine thank you.
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