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The U.S. struck an al Qaeda offshoot called Khorasan in Syria, but some fear the group will still attack U.S. interests.
U.S. authorities are concerned about homegrown extremists and lone wolf attacks in the homeland. Pamela Brown reports.
U.S. airstrikes in Syria also aim at the Khorasan, a group of senior al-Qaeda operatives believed to be preparing attacks.
An al Qaeda cell operating in Syria is posing a new threat to the U.S. CNN's Pamela Brown has the details.
Some officials say so-called 'lone wolves' are a more immediate threat to the U.S. than ISIS. Pamela Brown reports.
Pamela Brown reports that a suspect in a string of killings might have been motivated by strong anti-U.S. sentiments.
ISIS is targeting Twitter employees for shutting down and suspending their accounts. CNN's Pamela Brown reports.
ISIS militants might be among the best equipped jihadist groups in the world. CNN's Pamela Brown reports.
According to Iraq's government, terrorist groups seized almost 90 pounds of uranium from Mosul University.