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it was very shocking that somebody i know. very heart breaking. i never thought it could happen in any town, or especially someone that i know at all. >> reporter: despite the social media posts, an uncle who lived with the suspect told cnn his nephew was not violent. >> the warning signs, i saw him yesterday evening, and i went home, and i said, i went down stairs and said bye. that was it. that was it. i see no, nothing that could trigger him doing that. >> the weapon, do you have any idea where -- >> i'm not sharing that, no. >> reporter: despite what this uncle say, we now know t...

>> he was very quiet. he didn't talk that much, and when he did talk, he seemed very gentle. he didn't seem like aggressive or anything at all. it was very shocking that somebody i know. very heart breaking. i never thought it could happen in any town, or especially someone that i know at all. >> reporter: despite the social media posts, an uncle who lived with the suspect told cnn his nephew was not violent. >> the warning signs, i saw him yesterday evening, and i went home, and i said, i went down stairs and said bye. that was it. that was it. i see no, nothing that could trigger h...

I know of no procedure that puts those type of callouts into any decision as to whether a person should own a gun. they should be considered but there is nothing to link those events in police records to a purchase of a weapon that might only be federally limited or regulated. >> well, you know, the point he's making, obviously, scott, in terms of what the constraints in terms of what law enforcement might be able to do proactivity about the issues. but in terms of what they are doing reactively. they have dressed a photo of the shooter dressed in women's clothing in the attack. this person is...

They are quoted saying the gunman was randomly driving around shooting people. one or more of his victims were shot while both shooter and victim were in moving vehicles. . without sounding glib, that's not the easiest thing to do. >> no. for law enforcement, this is a real change in tactics by attackers in these mass shooting incidents. you know, normally what we see is a mass shooter at a specific location where law enforcement can then respond into, cordon off, set a perimeter, and address the threat. here we had, the threat was mobile. it was at various locations throughout the city. and t...

Start researching who this individual was, did he have any connection to a particular ideology, did he have a tendency toward violent action. they're going to look back in his history to understand did he have violent tendencies in the past? interaction with law enforcement. does he have a criminal history? all of those things are going to start putting this together to actually answer the question why. why did this occur? why were these officers shot at? why were there five dead, all these people wounded on a weekend. >> we know he had a rifle no, specifics on what sort of rifle but a rifle n...