(From Reuters)
President Barack Obama vowed on Sunday to hunt down anyone plotting militant attacks against the United States as he sought to reassure Americans after a deadly California shooting rampage that has raised new questions about U.S. defenses against homegrown extremism.

to reassure Americans on the US strategy to combat terror
In a rare Oval Office address, Obama tried to counter mounting criticism he has not acted decisively enough to keep the United States safe from the Islamic State militant group, but he stopped short of offering any major shift in his strategy.
“The threat from terrorism is real but we will overcome it,” Obama said in a nationally televised speech.
Obama spoke just four days after U.S.-born Syed Rizwan Farook, 28, and his Pakistani wife, Tashfeen Malik, 29, opened fire on a holiday party for civil servants in San Bernardino, California, killing 14 people. The pair were killed hours later in a shootout with police.
Obama condemned the attack as “an act of terrorism designed to kill innocent people,” and called it a “new phase” of terror threat that seeks to “poison the minds” of people there and around the world. Read more