FBI Head: Potential Violence Plots Stopped Ahead of July 4

The FBI stopped several potential acts of violence in the month before the July 4 weekend, FBI Director James Comey said Thursday. Comey said he believes that some of the more than 10 people arrested during that time were planning acts of violence tied to the holiday. Comey also said the current crop of Westerners attracted by the Islamic State's messaging is so unpredictable that it can be hard for federal authorities to ever be sure of their plans. Whereas Al-Qaida would train operatives and carefully scope out targets, the concern among law enforcement officials is that the Islamic State is motivating people to commit violence "on a very short string."