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-- live in Boston three hours and 45 minutes until the sun sets in this great American city.
It's been largely speculated that the reason why there was a tip off last night is because when night fell the two suspects felt they had to make a move.
And if that is the case it's possible that suspect number to -- -- low into the nighttime comes again.
7:30 PM local time that sun sets here.
I -- -- before the break Catherine Herridge working your sources about some of these YouTube clips that we've now been alerted to about perhaps.
Were linked to web sites that that the suspects have been going to sometime on the Internet.
Back to Katherine now with the latest on the intelligence that she is gathering from her sources in Washington DC now -- alone.
Well thank you bill Fox News understands that all the electronic traffic associated with the Brothers is now being scoured including the YouTube site.
-- tribute to the suspects which included radical Islamist videos and propaganda.
Investigators are working to verify whether the sites associated with the Brothers were in fact there's and that they made those postings.
Fox was told nothing is being taken for granted in -- to the authenticity.
We now the third source confirming to us that all travel records are being reviewed and the older brother was out of the US in early 2012.
For a period of prolonged period of time to Russia.
This is -- investigated interest.
Because the FBI is working to -- understand whether the Brothers or one of the Brothers had foreign training or was directed by a foreign terrorist organization.
Fox News is told that the bomb maker who made the devices would have needed practice to build a device with a viable detonator.
Fox News also understands that investigators are eager to execute warrants at the residence is associated with the suspects -- review their computers.
But this is being approached with extreme caution given the potential after this week's explosions that they left to booby traps.
Well no -- final determination has been made so far there's no evidence to support the view that the Brothers were acting on behalf of the checks in -- But the motivation for -- actions remains wide open.
-- told investigators will be looking at the computer traffic for the al-Qaeda web magazine inspire which -- provides a guide on how to build these pressure cooker bombs.
In addition one of the observations I would make.
Is that the information seems to be very.
-- bill locked in in the sense that it's fluid and locked down in the sense that they don't want to get it wrong either bill.
Now understood clearly inspire magazine found it ironic led by and a while locking in American born.
Radical cleric born in New Mexico later killed with a predator drone outside of the capital city in Yemen Katherine do you have any information yet on what might be happening overseas.
Specifically southern Russia or other parts.
I don't at this time bill.
Okay when you're talking with sources about trying to put together this electronic fingerprint and -- And that we talk so much yesterday about the forensic science.
Had they been able to advance that much or has that been put on hold right now.
Knowing that you named two suspects -- -- wanna go and apprehend them because that then becomes the priority.
Well the investigation the investigation has been moving on several parallel.
Tracks there's been what I would call the video.
And the images and then the social media -- that we discussed yesterday.
Now we have an active manhunt and that is taken precedence.
Over everything else and then you have a separate track.
Which is the the forensics.
On the bomb itself the forensics track can move very independently.
From what is going on in Boston today and as we reported this week.
The bomb components themselves are relatively intact which -- allowed them to make good identifications.
On some of the components.
Catherine thank you back to Catherine -- when she gets more in the meantime here in Massachusetts -- of one MIT officer -- Another officer wounded being treated for.
What's considered critical wounds suspect number one is dead number two not found.
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