Al Qaeda bomb-maker alive and plotting?

(CNN) – The U.S. intelligence community is saying one of the most dangerous terrorists in the world survived U.S. airstrikes in Syria.

He isn't a member of ISIS, but a French bomb-maker for the terror group know as Khorosan, an al Qaeda affiliated group with a focus on recruiting foreign fighters with western passports to carry out terror attacks on airlines.

Despite the flashy videos and barbaric executions staged by ISIS, officials say the French bomb-maker may be the biggest threat to the United States right now.

CNN's Pamela Brown reports.