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Story highlights

NEW: FBI says couple was at a lake that is now being searched by divers for evidence

Tashfeen Malik and husband Syed Rizwan Farook were radicalized before dating online, the FBI says

A friend of Farook says both men planned a 2012 attack but abandoned it

(CNN) —  

The San Bernardino mass shooting caught authorities by surprise. Neither of the two shooters, Syed Rizwan Farook and Tashfeen Malik, were on law enforcement’s radar.

One week later, the investigation has turned up that while the possibility remains that the couple were self-radicalized, their terror plot did not happen in a vacuum.

These are the latest and most significant investigative leads so far:

Thursday

Farook was in the same ‘social circle’ as convicted terrorist, FBI believes

The FBI believes Farook had ties to a group of jihadists in California who were arrested in 2012 for attempting to travel to Afghanistan to join al Qaeda.

Specifically, investigators are taking a new look at one of the four men who was arrested in the 2012 case, Sohiel Kabir. Kabir, who was convicted and sentenced to 25 years in prison, was the recruiter who helped radicalize others.

The 2012 probe happened in Riverside, California, not far from San Bernardino. Farook was in the social circle of Kabir, officials told CNN.

The FBI initially investigated five men as part of the Riverside group. The fifth wasn’t arrested and hasn’t been identified. But Farook was not among those investigated at the time, the officials said.