intercept this particular radicalized individual. reporter: he arrived in germany a year and a half ago, his father telling a radio show that his son headed to cologne after spending four years in an italian prison. he was convicted of damaging state property, assault and arson. but they note he was considered a petty criminal. in germany he was quickly placed under surveillance believed to be in touch with radical islamis islamists. in june his ask for asylum was deni denied. two months later amri was arr t arrested after being caught with fake papers but released. still considered a risk by authorities with known link to a radical preacher. the germans are a very good service and they re going to put all of their resources to find this person and this killer and bring him to justice.