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-- it's modern high tech.
Involving sophisticated extensive analysis of that 21 century phenomenon called social media.
Chief intelligence correspondent Catherine Herridge is here with details captured.
Well thank you Brett tonight as the FBI asks for the public's help -- the United States and on an international basis senior government officials telling congress the investigation.
Is wide open.
No determination has been made on whether Boston was a domestic or international active terrorism.
Underhill the nation's intelligence chief updated lawmakers on the case.
We don't know yet for the attack was planned and executed by -- terrorist organization foreign or domestic or -- was an individual act.
Lone wolves domestic extremists and -- inspire affiliated groups are certainly determined to attack.
With -- bomb components largely intact and the analysis by the FBI's crime lab in Quantico Virginia ongoing.
The head of the house homeland security committee told Fox News -- -- needs are expected soon.
There tracers in the gunpowder the the pellets and -- -- ball bearings so I can be traced to manufacture.
And then the device itself.
The explosive device itself destroy the best evidence.
That we have.
In addition to still images and video and investigative source tells Fox News that there is quote as significant social media footprint providing new leads for investigators.
More than 30000 social media messages were collected within a one mile radius of the finish line from 24 hours before 224 hours after the explosion.
Messages that seemed out of place or coated including tweets about two Boston hotels were analyze further.
Jonathan Gilliam is a former navy seal and former member of the FBI's joint terrorism task.
Force and unconventional warfare.
What you're starting to see more more -- is the use of social media.
To spread messages in his first public comments since the bombings the attorney general offered few details I want -- sure you.
The citizens of Boston in all Americans that we are working tirelessly to.
Determine who was responsible for -- this incident.
And -- Fox News is developing new information that federal investigators are asking foreign government.
To help them review travel records that may be connected to this case back.
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