President Barack Obama warned Americans on Sunday the terrorist threat to the United States had evolved into a dangerous "new phase" in the aftermath of a deadly California shooting rampage, but vowed to destroy Islamic State and other militant groups.
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 FBI is investigating the paramilitary-style attack in California as inspired by Islamic State, which controls swaths of Syria and Iraq and has shown an expanded reach beyond its Middle East strongholds, including complicity in the Nov. 13 assaults in Paris that killed 130 people.