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Boston Adam thank you investigators are furiously trying to track down the terrorism connection -- this case.
And they are focusing on a trip the older brother made last year.
She intelligence correspondent Catherine Herridge is yours -- -- -- an update on that couldn't catch well thank you -- some of the most compelling evidence.
And preliminary evidence comes from surveillance video and one eyewitness -- that carjacking Thursday night before -- with police when the brother -- quote.
Did you hear but the bus explosion.
I did that.
Court records filed Monday -- -- or nine -- Brothers wanted to -- since streak together eleven minutes before the explosions each with a backpack.
They split up one heading to the finish line and the other toward the form restaurant the site of the second explosion.
Thirty seconds before the first blast the younger brother started fidgeting with his cell phone presumed to be the method of detonation.
After the blast almost everyone turned around quote in apparent bewilderment and alarm for the nineteen year old remained calm suggesting for knowledge of the attacks.
As the court records were unsealed the white has defended the FBI's investigation of timberlands -- -- -- in 2011.
Two years before the Boston bombings after a tip from the Russian government claimed the 26 year old was a follower of radical Islam.
What we have a process in this country -- we have to find.
The grounds for action and and the FBI did an investigation and did not find grounds for action at the time.
Plus -- told that investigators are now doing -- a deep dive -- contaminants or nine a six month trip to Russia last year.
And -- the 26 year old had direct contact with known or suspected terrorists in the caucus region.
Despite weekend denounce investigators continue to probe possible links to Islamist and extremist groups including one known as the caucuses -- We -- Chechen terrorists including those related to -- -- -- -- Caucasus emirate.
For fighting in Syria Iraq -- in Afghanistan as well as elsewhere.
In 2007 the head of the cup -- Benin -- -- more often actually directly threaten the United States of America.
The FBI was unaware of the older Brothers tricked into when he twelve because he apparently traveled hundreds alias or the airline made an error on the spelling.
Based on a briefing Sunday night with an assistant director of the FBI a leading Republican senator said the bureau suspects the Brothers had outside help.
The FBI in the CIA and every intelligence agency we have is scrambling to figure out what's coming next.
-- is told that in -- 2011 the FBI for the Russians on at least two occasions the bureau had not had any derogatory information on the older brother.
And requested additional information.
But the bureau says there was no immediate response from the Russians -- okay Catherine thank you.
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