President Barack Obama said it's possible the mass shooting in California was related to terrorism but that authorities still don't know. He said it's possible it was workplace-related or that there were mixed motives.
Obama spoke in the Oval Office. He was assuring Americans that authorities will get to the bottom of what happened. The president also is calling for people to wait for facts before making judgments.
Obama said many Americans feel there's nothing they can do about mass violence. But he said "we all have a part to play."
The president said the nation must make it harder to carry out violence but acknowledged that the threat can't be eliminated completely. He said it will be important for all Americans, including state legislatures, to see what they can do.