is it true since world war ii you've not seen an enactment of security like this, 120,000 police shutting the loop that goes around paris here. >> forces that are mobilized for this event in terms of not only those on the streets that we can see but also the intelligence services, the oldest security forces, the french security forces are mobilized to ensure that this event will be a success in terms of security, of course, it's essential. >> what's driving this, why they are so concerned is because of what they have been learning about the amount and the depth of terror networks that they have in france. how big a challenge is it still, fabrice? >> it's a big challenge. it's not over. we are just two weeks until the event and everybody knows now that we have difficulties to