proud of their police work. recriminations mixed with belief. still, questions on why police stopped their surveillance of amri a few months ago and flounderred these last few days. amri knifing through borders from germany to france, then italy. all with authorities on high alert. by 9:00 p.m. on thursday, he was in turin, then milan four hours later. ending here at 3:00 a.m. on friday morning. confronted by two police officers outside the train station, first words. police italian, then gun play. the result, a body in a park lot. no i.d. and no cell phone. several hundred euros. u.s. isis released a shaky video of amri pledging allegiance to the group. tourists with conflicted feelings. i am concerned obviously at the same time. i don t feel unsafe. reporter: germany s top prosecutor looking to improve the state s response.