Two people familiar with the investigation into the San Bernardino, California, attack say investigators are looking at whether the husband accused in the shootings was planning an attack in 2012 but abandoned those plans.

The two spoke on condition of anonymity because they weren’t authorized to discuss the matter publicly.

The shooting attack by 28-year-old Syed Farook and his wife, 29-year-old Tashfeen Malik, last week killed 14 people and left 21 injured. Former neighbor Enrique Marquez bought the two rifles used in the attack.

One of the two people, a law enforcement official briefed on the investigation, says Marquez has told investigators that he and Farook planned an attack in the United States in 2012 but abandoned the idea. Marquez is a relative of Farook’s through marriage.

The official says it’s unclear what spooked them into cancelling the apparent plot.

(AP)