[PghBaldy]

https://wtaq.com/2021/01/31/shooting-reported-at-fox-river-mall-in-appleton/

[Steve_Seattle]

From the story at your link: “An altercation broke out between more than one person, don’t know how many people, I was standing there right by Scheels and Panda Express and I heard gunshots rang off”

Apart from the fact that an "altercation" by definition involves more than one person, this is starting to have a familiar ring to it. Perhaps a group of "youths" was involved.