Toulouse, the fallout: A closer look at the shooter's background (part 2)

A week after the death of Mohamed Merah, a lot of questions still remain unanswered as to how he was able to go on a killing spree, whether he was helped, and what his relation with the French intelligence services was. François Picard and his panel discuss these issues and, more widely, whether it is possible to prevent this kind of tragedy. They also look at the impact on France's presidential race just three weeks ahead of the first round.