Law enforcement and intelligence officials continue to gather evidence on the motivation Wednesday's mass murder in San Bernardino, Calif., but nearly all indications thus far suggest Islamist radicalization was a significant factor.
Syed Rizwan Farook and Tashfeen Malik killed 14 people at an office party for county workers, Farook's colleagues, and later were killed in a shootout with law enforcement officers. Preliminary investigative work already has found that Farook was radicalized and communicated with extremists.


















