[Blitzer:] Breaking news, a desperate manhunt is underway right now for a surviving suspect in the bloody Paris attacks. The ringleaders are thought to be top ISIS figures in Syria. The CIA director John Brennan says ISIS likely has more attacks in the pipeline. And the terror group is warning of more to come. In fact, in a new video it says it will strike right at Washington, D.C. Let's bring in our justice correspondent Pamela Brown. Pamela, what are you learning about this investigation?
[Pamela Brown, Cnn Justice Correspondent:] We're just getting some new information, Wolf. Multiple officials telling CNN that none of the bombers identified so far in the Paris attacks have been on any U.S. watch list, raising new questions about how the U.S. and its allies were able to track Syrian foreign fighters.
[Brown:] The attacks, French officials say, were plotted well in advance from inside Syria. What remains a mystery tonight is how three teams of terrorists were able to launch coordinated attacks under the radar of Western intelligence. An international manhunt is underway for Salah Abdeslam. Sources say the 26-year-old French national was stopped by police just hours after the attack and then released. Investigators say his brother Ibrahim blew himself up at a cafe in Paris.
[Mohamed Abdeslam, Brother Suspected Of Terror Attacks:] We did not think for a moment that one of our brothers was related to these attacks.
[Brown:] A third brother, Mohamed, was arrested after the attacks then released in Belgium. He spoke to reporters saying he does not believe his brother was involved in the attacks. We're also learning more about the other attackers, French national Bilal Hadfi, one of the alleged suicide bombers at the soccer stadium, and Ismael Omar Mostefai, one of the suspects at the Bataclan concert hall. Officials say a man using the name Ahmad al-Mohammad entered Europe through Greece posing as a refugee and blew himself up at the Stade de France. Samy Amimour who detonated a suicide belt at the Bataclan had been a subject of an international arrest warrant since 2013.
[John Brennan, Cia Director:] This was something that was deliberately and carefully planned over the course, I think, of several months in terms of making sure that they had the operatives, the weapons, the explosives with the suicide belts.
[Brown:] Six of the attackers spent time training in Syria. Belgian authorities confirmed they lost track of some of them.
[Koen Geens, Belgian Justice Minister:] We were not aware that some of them already returned.
[Brown:] Tonight intelligence sources tell CNN at this point of the investigation it does not appear any of the attackers were known to the U.S. Today, Attorney General Loretta Lynch addressed potential risks of foreign fighters launching an attack on U.S. soil. [On Camera] Do you feel that there's adequate intelligence sharing with our European counterparts to prevent people like the Paris attackers who we know went over to Syria and trained from boarding a plane and coming to the U.S. given the visa waiver program?
[Loretta Lynch, Attorney General:] Our relationship with our European counterparts in this area is robust. And it is strong. And we are always working to make sure that not only we but they also have the information that they need.
[Brown:] And U.S. investigators are increasingly convinced the attackers used encrypted communications to evade French intelligence. One U.S. official describing that as an educated presumption in part because some of the attackers who French authorities already had information on before the attacks were known to have used popular encrypted apps. In addition U.S. analysts have been combing through signal intelligence including e-mail and other communications, and have turned up very little, Wolf. Still very early on in this investigation. Yes. Hopefully they get some progress and they'll find all these guys and find them quickly. Pamela, thanks very much. We're following the breaking news in a newly released video. Members of ISIS now threatening attacks in Europe and in Washington, D.C. The Department of Homeland Security and the FBI now say there's no specific credible information of an attack on the U.S. homeland. Not so long ago ISIS fighters were concentrated on capturing territory largely in Syria and Iraq. Brian Todd is looking into this apparent change in their strategy. What are you finding out, Brian?
[Brian Todd, Cnn Correspondent:] Wolf, tonight we're getting new information about the shifts in tactics by ISIS. The coordinated assaults in Paris we're told coming in the wake of the Beirut suicide attacks and the downing of the Russian passenger plane together signify game changing measures from the terror group which have put Western intelligence on its heels.
[Todd:] The moment inside the Bataclan Theater when terrorists unleashed their Kalashnikovs. Coordinated suicide bombers detonate outside the packed Stade de France. The carnage in Paris leading U.S. and European officials to warn tonight that ISIS is turning a page in its strategy.
[Brennan:] ISIL has developed an external operations agenda that is now implementing it is implementing with lethal effect. Their agenda is to kill. Pure and simple. As referred to them as murderous sociopaths.
[Todd:] Paris was hit the day after ISIS claimed responsibility for twin suicide bombings in Beirut. An ISIS affiliate is believed to have brought down a Russian passenger plane with 224 people on board. Three devastating terror hits in less than two weeks.
[Thomas Sanderson, Center For Strategic And International Studies:] ISIS is clearly emboldened by these attacks. I've seen this sort of damage and destruction that is created.
[Todd:] But why now when a principal goal of ISIS to this point has been to capture and hold territory in Iraq and Syria?
[Michael Weiss, Author, "isis: Inside The Army Of Terror":] As ISIS loses terrain, particularly in northern Syria, they want to increase, escalate the number of attacks that they wage abroad because, again, this is the way that they sell themselves.
[Todd:] The Paris attacks bore the hallmarks of al Qaeda, coordinated cells, well-planned, high profile, designed to inflict mass casualties. And there's growing evidence tonight that ISIS'central leadership in Iraq and Syria is calling the shots in these as asymmetric attacks. Sources in France tell CNN two prominent ISIS members thought to be in Iraq or Syria may have masterminded the Paris onslaught. One of them, Abdel-Hamid Abu Oud, is, according to a source very close to ISIS leader Abu Bakr al-Baghdadi. The source says Abu Oud would certainly be in contact with Baghdadi in planning an attack like this. What is ISIS'goal in launching mass casualty attacks on soft targets?
[Sanderson:] I think their goal in conducting these attacks is to push back those who are pushing against them and to make sure that people feel vulnerable at home such that they will maybe not engage in the kind of counter ISIS activities that we've seen of late.
[Todd:] And more asymmetric attacks could be on the way from ISIS. CIA director John Brennan says given the resources devoted to the Paris assaults, the weapons, the explosives, that probably wasn't the only operation ISIS had in the pipeline. And in a new propaganda video put out since the Paris attacks, ISIS has threatened to hit Paris again, to attack Rome and Washington, D.C. Wolf.
[Blitzer:] And U.S. officials are taking those threats seriously. Brian, thanks very much. Let's bring in our experts, former congresswoman Jane Harman, she was the top Democrat on the House Intelligence Committee, she now heads the Woodrow Wilson Center here in Washington. Also joining us our national security analyst Peter Bergen and our counterterrorism analyst Phil Mudd, a former CIA official, as well as CNN military analyst, retired Lieutenant General Mark Hertling. Guys, we have a lot to assess right now. Let me take a quick break. We'll gather the information. Much more on the breaking news right after this.