President Barack Obama said Thursday terrorism or a workplace dispute could have motivated a couple to carry out a deadly shooting rampage in California that left 14 people dead and 17 others injured. Speaking at the White House, Obama said, "It is possible this is terrorist related, but we don't know. It could be workplace violence. There may be mixed motives in all this. We don't know their motivations." Obama added, "I can assure the American people we will get to the bottom of this."