radicalization. the prisons, whether it is in the middle east or europe, they are becoming schools for people who like anis amri who go in as petty criminals and come out as radicalized potential terrorists. that seems to be what happened, perhaps, with him when he spent time in italian prison. ben, stepping back from this a bit. we have foiled plot attack in germany. a foiled plot in australia right now. what is the sense in rome and across cities in italy as we move into the christmas season? are they on alert for amri, clearly, but for other attacks as well? reporter: certainly. there has been an increased police and armed police if