Investigators were still uncertain about possible targets that may have been identified by Tashfeen Malik, 29, and her US born husband, Syed Rizwan Farook, 28, the source said.

The couple killed 14 people and injured 21 on Wednesday when they opened fire on a gathering of public employees in Southern California.

The source also said investigators do not believe Enrique Marquez, the man suspected of providing weapons to the couple, is linked to terrorism but are still investigating.

Latest News from World News Desk