Obama Seeks to Reassure Nation Faced With Evolving Terror Threat

President Barack Obama sought to soothe a nation shaken by the terrorist attack in a California town with assurances that the U.S. is hardening its defenses, tempered by an acknowledgment that the threat has evolved.

Delivering an address from the Oval Office for only the third time in his presidency, Obama Sunday the shooting rampage in San Bernardino was an act of terrorism carried out by a Muslim couple radicalized by extremist ideology, though not directed by a foreign group. He cautioned Americans not to discriminate against Muslim-Americans, saying that would play into the hands of Islamic State and other terrorists.