> In the mall, after 17 o clock the refugee/migrant youth would group together and hang out. That didn't feel safe either

Basically that's because there are no squares or other spaces where they CAN hang out.

I had a similar experience in sweden. In the end they are just meeting their friends. It feels weird I think because whites don't really meet their friends like that. At most they go into a cafè/bar, but you need money for that. And in sweden cafè are really expensive, and pubs… well require you to drink alcohol, so there really aren't many around migrant areas.