There was a mass escape from a prison in Yemen, but no escape from a French prison that I can recall.
Not long ago Germany released a terrorist who killed an American after the bad guy was in prison about 7 years -- the Germans said he fully served his "life" sentence. The same thing would happen in France if we give back Moussaoui.
Yemen is more recent, but I know I heard that some Muslims being held in a Paris(?) France jail, escaped or were busted out.
France and Germany are bound and determined to commit national suicide. I hope we aren't going to follow in their footsteps.