FBI Chief: ISIS Bigger Threat than al-Qaida

The Islamic State group's effort to inspire troubled Americans to violence has become more of a terror threat to the U.S. than an external attack by al-Qaida, the FBI director said Wednesday.

FBI Director James Comey told an audience at the Aspen Security Forum that the Islamic State group, which has proclaimed a caliphate in parts of Syria and Iraq, has influenced a significant but unknown number of Americans through a year-long campaign on social media urging Muslims who can't travel to the Middle East to "kill where you are."...