I think the reason Bosnian was thrown into the mix was because thugs killed a Bosnian man last week. I agree that they probably just saw a “white” face and it happened to be another Bosnian.
Black thugs in St Louis seem to have declared war on Bosnians (and St Louis--Bevo Mill Neighborhood specifically--has the largest population of Bosnian immigrants in the U.S...and they are thriving on American freedom).