during the jubilee, we ll be very busy. the army and other security agencies will also be here so we ll have a maximum synergy in the event of an emergency. u.s. embassy here has warned that st. peter s basilica, among other sites has been identified as a potential terrorist target, and has advised americans to remain vigilant and aware of their surroundings. then again, to steal a line, you can t just hide under a stone. ben wedeman, cnn, rome. you re watching cnn newsroom. and we are following new developments in the paris terror investigation. still ahead, we take a look at how authorities managed to track down the man who organized last friday s attacks. stay with us. [announcer] when you see this truck,
reporter: a victory against terrorism. but many questions remained. the french had no idea that abaaoud was back in europe, had slipped across the borders undetected. it was tip from moroccan intelligence that led to french to believe that abaaoud had left syria and was back to begin a campaign of terror. the question for france now, and for all of those on this don continent, are there any more like abaaoud who slipped into europe? nic robertson, anyone, paris. and we re learn much more about the ringleader of last friday s terror attacks. as we reported, abdelhamid abaaoud was killed in that raid on wednesday. and now we are hearing about his family relationships. cnn s erin burnett spoke with nathalie galat, the attorney representing his father.