ahmad rahani, court documents show his firpg prints were found all over the pressure bomb blocks away from the explosion purchase materials used in the home-made bombs, this as we are learning new details about rahani, including the contents of a rambling notebook he had on him when he was captured. nbc's miguel almaguer reports. >> reporter: after ahmad rahani was shot by police monday, investigators say they found a journal, pierced by a bullet, filled with anti-american sentiments. law enforces call it a ramg events. noted inside the ft. hood shooting and vengeance about prop began that and al alaki. >> we know his path around the world. >> reporter: with investigators diving deeply into his repeated lengthy visit to afghanistan and pakistan, they confirm as spoken in the past with the fbi. in 2014, after a trip oversea, officials were called to his home where he stabbed his brother in the leg arc neighbor called him a terrorist. he told the fbi, he was angry. he had no reason to think his son is a terrorist. >> the investigation into his activities at this time did not indicate an

ahmad rahani. >> and that news conference just wrapped last hour. they told reporters they're going to build out what they call his social network. that involves something called link analysis. that's when they take your phone contacts as well as your e-mail and they literally draw connections between the phone k calls and e-mails you're sending, and they significantly determine the strength of those relationships. so for example, you may not talk to someone very often, but if you talk to them for two or three hours at a time, that may be considered a stronger connection in your social network than someone you speak to frequently but for shorter periods of time, and whether or not you do it voia e-mail or texts. >> so interesting. let me ask you also, what did we hear from the head of homeland security about this case? >> the head of homeland security was speaking in washington this morning, and he really spoke to the current threat picture, saying there may be something behind the scenes they have to confront. >> no credible threat is evolving. thi

. >> reporter: after ahmad rahani was shot by police monday, investigators say they found a journal, pierced by a bullet, filled with anti-american sentiments. law enforces call it a rambling series of references to past events. shooting and a mention about propaganda about anwar al awlaki. >> we know his path around the world. >> reporter: with investigators diving deeply into his repeated lengthy visit to afghanistan and pakistan, they confirm as spoken in the past with the fbi. in 2014, after a trip oversea, federal law enforcement officials were called to his brother in the leg and a neighbor heard him yell, you're a terrorist. he told the fbi, he was angry. he had no reason to think his son is a terrorist. >> the investigation into his activities at this time did not indicate any radicalization or nefarious activities. >> investigators are seeking answers from his wife asia bibi rahami. they were married in 2011. she was living in pakistan and applied for a u.s. visa. >> they found out she was pregnant, then they told her she couldn't come in until she had the baby. >> reporter: