Hadn't heard of this at all until you posted about it.Honestly I would just try looking it up. There are a bunch of articles and I dont know which are good sources. I saw on social media everywhere and tried to track down good information on it but its all over the place. But here is a couple articles on it.
https://newsone.com/3965112/milwaukee-missing-black-girls-found-report/
https://heavy.com/news/2020/06/watch-milwaukee-crowd-burns-down-suspected-sex-trafficking-house/
Both are pretty left biased sources though, but Heavy is usually pretty factual with their information I believe. Newsone is so so from what I see, but I dont read either source.