President Obama attends Navy Yard shooting memorial

WASHINGTON (AP) - President Barack Obama is memorializing the victims of the Washington Navy Yard shooting by urging Americans not to give up on a transformation in gun laws that he argues are to blame for an epidemic of violence. Obama says "There is nothing inevitable about it -- it comes about because of decisions we make or fail to make."

At a memorial service Sunday for the 12 men and women killed at the Navy Yard last week, Obama issued a call to action on gun control measures that failed to pass earlier this year and show no new momentum in the wake of last week's rampage. He said, "Our tears are not enough."

The president told the thousands gathered at the Washington Marine Barracks that when such senseless deaths strike in America, "it ought to be a shock to all of us, it ought to obsess us. It ought to lead to some sort of transformation."

Obama said it has become clear that change will not come from politicians in Washington, who have been unable or unwilling to change the nation's gun laws even when tragedy strikes the capital city. Instead, Obama said change will have to come the only way it ever has -- from people demanding action.