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locations of these shootings this weekend, three people killed there, 11 wounded after multiple shooters in this case opened fire at a crowd. first, polo, begin with what we know about the shooting there in philadelphia. >> reporter: and, jim, unlike those cold-blooded massacres we saw play out or carried out in buffalo and texas, this started as a street brawl but it took a violent and deadly turn when some of the convince involved according to police used firearms opening fire sending people scrambling for safety. in the end three people were killed with about 11 people injured. in...

Experience essentially the number of mass shooting-related fatalities decreased to zero for the 23 years following the implementation of their assault weapons ban. and you see similar experiences in the uk, more recently canada has instituted legislation to ban assault-type weapons or weapons characterized as assault-type weapons and that experience s you know, currently being reviewed and the conclusions from that are still pen pending. >> to zero in australia and people often make a comparison saying that's a better comparison for the u.s. given frontier culture, more of a history with guns....