New Details on How San Bernardino Shooters Were Radicalized

Investigators say Syed Farook and Tashfeen Malik were exchanging their visions of terrorism online by late 2013.
2:04 | 12/10/15

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Transcript for New Details on How San Bernardino Shooters Were Radicalized
We begin with the FBI's intense search for answers in that terror attack. The head of the agency says the killers were radicalized before they even met. Now the feds trying to unlock the secrets on their phones and computers. ABC's Matt Gutman starts us off in San Bernardino, good morning, Matt. Reporter: Federal authorities, George, are telling us that the terror couple had -- tashfeen malik and Syed farook not only tried to destroy their data but encrypted some, as well. No use that the use of encryption is part of terrorist trade craft. Reporter: Telling ABC news they were only to crack some of their phones, computers and thumb drives. What did they salvage? Pictures of farook's phone of this San Bernardino high school with its 2500 students. Was it a target? We're working very hard to understand did they have other plans? Reporter: What is clear investigators say plans were laid years before. Farook may have been radicalized in 2012. And by late 2013, farook and ma malik were exchanging their visions online. Talking about jihad and martyrdom before they were engaged and married. Reporter: Investigators checking whether they were a match made specifically for terror. At least in this one instance the Jihadi websites and chat rooms prove to be a match making service. The FBI will now be looking to see if this pattern occurred elsewhere. Reporter: And also looking to see whether malik was brought into the country on that fiancee Visa to set up the sleeper cell striking mayhem when it activated. Of course, questions swirling about how tashfeen malik managed to get into the U.S. On that fiancee Visa. If she had been fantasizing online about terrorism and jihad for at least a couple of years, authorities also investigating whether or not other terrorist matchmakers managed to infiltrate their people into the country using that Visa, as well. Robin. Thank you, Matt. The investigation continues.

This transcript has been automatically generated and may not be 100% accurate.

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