These victims may very well be Muslim.
Bosnia is a region. Most of the people who live there are Muslim.
Catholic Croats, Orthodox Serbs and Bosnian Muslims all refugeed from the fighting in Bosnia.
But I think Bosnian Serbs and Croats are more likely to identify themselves as such, while Muslims are more likely to call themselves Bosnians. All three groups are entirely white, often blond and blue eyed.