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Why was the Khorasan bomb-maker such an important target? CNN's Pamela Brown has the details.
Officials are concerned members of the Khorasan Group survived and are plotting against the U.S. Barbara Starr has more.
Watch CNN's full interview with Matt Olsen during "The Situation Room," airing from 5-7 p.m. ET.
The former head of U.S. counterterror operations said Tuesday the "imminent threat" posed by an al Qaeda offshoot in Syria hasn't lessened after a U.S. air campaign there.
Speaking to CNN's Jim Sciutto, Matt Olsen said by his analysis the threat from the Khorasan group "is still in the same place as it was before" President Barack Obama ordered airstrikes against the terror operation last month. Full story
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. airstrikes in Syria also aim at the Khorasan, a group of senior al-Qaeda operatives believed to be preparing attacks.