WASHINGTON - U.S. President Barack Obama is to address the nation Sunday night on steps to fight terrorism in the wake of the shooting massacre in southern California, the White House said Saturday.

Obama will provide an update on the ongoing investigation into the Wednesday tragic attack in San Bernardino, California, in which two shooters killed 14 people and wounded 21 others, the White House said in a statement.

It said the steps being taken by the U.S. government after the attack were aimed at fulfilling Obama's highest priority: keeping American people safe.

"The president will also discuss the broader threat of terrorism, including the nature of the threat, how it has evolved, and how we will defeat it," the statement said.

Obama will reiterate his firm conviction that the Islamic State (IS) will be destroyed and that the United States "must draw upon our values -- our unwavering commitment to justice, equality and freedom -- to prevail over terrorist groups that use violence to advance a destructive ideology," it added. (Xinhua)