"Hunting Terrorists" author: Tsarnaev likely left trail - WFLA News Channel 8

"Hunting Terrorists" author: Tsarnaev likely left trail

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Fmr. FBI agent & author Joe Navarro Fmr. FBI agent & author Joe Navarro
TAMPA, FL (WFLA) -

Former FBI agent and supervisor Joe Navarro says the investigation into how and why the Boston Marathon bombings occurred has already started.

Navarro spent 25 years at the agency, and specialized in counterintelligence and counter-terrorism.  He wrote a book used by the FBI called "Hunting Terrorists."  Navarro says while the suspect may not be speaking with investigators yet, they are already looking into him.

"More importantly than what they can get out of him immediately, is the forensics that we'll be able to get by looking at things such as his telephone, travel records, social media and so forth," said Navarro.  "Most people leave an incredible record of who they've talked to, how frequently they've talked to, what they've talked to them about."

Navarro says the FBI will be the lead agency in the investigation, and agents will likely zero in on Dzhokhar Tsarnaev's acquaintances.

"One of the things we look for is frequency, duration and intensity of contact," said Navarro. "Who have they been associating with and who has been planting ideas or concepts in their head. So we're going to look at their forensics first, we're going to look at their travel records, passports, telephone activity.  That will tell us a lot."

On Saturday evening, Boston officials said Tsarnaev was "not able to communicate yet".

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