BOLDUAN: First on CNN, European officials say 30 to 40 suspected ISIS terrorists who helped support the Paris attacks last November are still at large. And ISIS is now planning to ramp up attacks after big losses in Syria, Iraq and Libya.</s>BERMAN: Let's bring in CNN senior international correspondent, Clarissa Ward. Clarissa, what can you tell us about this?</s>CLARISSA WARD, CNN SENIOR INTERNATIONAL CORRESPONDENT: John and Kate, this should come as no surprise to many of us who have been following this story so closely and combing through tens of thousands of pages of documents pertaining to the European investigation. I've spoken to several sources inside Belgium primarily who say 30 to 40 people who were directly involved in the network that facilitated the Paris attacks are still at large. And so the question becomes, how is this possible and what does this mean? And a deeper look into how these networks reveal, essentially gives you a better idea of why this is a challenge for security services. Because what emerges is that ISIS is quite sophisticated in how it handles or manages its networks. And that means only a very small core group of people know the full picture, know the entire attack as it is planned. All other people who are brought in are brought in essentially on a need to know basis. So they might know something, that they have just been instructed to try to find some AK- 47s or just been instructed to find a safe house for a brother who is visiting from Syria. They don't necessarily have the full picture. They don't necessarily know the full scope. And that makes it very difficult for security services when they're trying to drill down on these networks, when they're trying to prosecute people for their involvement with these networks --
Up to 40 ISIS Paris Suspects Still At Large.