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December 2 marks the one-year anniversary of the terrorist attack that shook the community of San Bernardino, California, in 2015.

Syed Rizwan Farook and Tashfeen Malik, a married couple, opened fire at a private luncheon event at the Inland Regional Center, killing 14 and seriously injuring 22.

Authorities later shot and killed both perpetrators during a standoff  in a suburban neighborhood.

Bill Gavin, former FBI assistant director for New York and former chief FBI investigator for New York, Miami and Denver, joined Jenna Lee on Happening Now Friday to provide an update on where the investigation stands one year later.

Several questions persist as to what happened in the 18 minutes between the attack and the police chase, what investigators found on the recovered hard drive and electronic devices and whether anyone else aided the terrorist couple.

"It appears to me that there's perhaps a third party involved here and not just necessarily an individual but the concept of Islamic terrorism itself in directing this whole operation," said Gavin, who specifically questioned the role of Malik in the attack and how she linked up with and radicalized Farook.

Lee noted that a common theme existed among recent alleged terror attacks, including the recent bombing in New York City and slashing at Ohio State University, in that the assailants may have been radicalized by the ideology of Anwar al-Alhaki, who died five years ago and was alleged to have played a role in planning terrorist operations for al-Qaeda.

"I'm sure there is a lot of work being done behind the scenes to see who or what is the driver of all these terrorist attacks that have been committed and are being planned as you and I sit here today," Gavin said.

The FBI investigation into the San Bernardino attack is ongoing.

Watch the full interview segment above.

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