I'm not sure if there was 400 000 Romanies in former Yugoslavia?
Also, why would anyone target them in conflict between Serbs, Croats, Bosniaks and Albanians? No reason whatsoever...
I did the math. There is around 600, 000 Gypsies in the former Yugoslavian states at the start of the war. Killing 400,000 would severely curtail their population.
Honestly I can see Gypsies being hated by all sides of the Yugoslavic Wars and being deliberately targeted by them. You know the European committee only started making a body that investigated prosecution against Romani people in 2011? That shows how racist and disliked Romani people are. In a Yugoslavic War period that is more violent I can easily see massive death tolls on a convenient minority everyone hates.
Basically they're not considered people by most Europeans at the time.
Anyways here's how I'm breaking the Non-Romani Body Count by current countries:
Slovenia: 465
Croatia: 179,126
Bosnia: 707,888
Kosovo: 110,677
Macedonia: 1,845
Total Death Toll: 1,000,000
The Romani Death by Conflicts by location is:
Slovenia: 20
Croatia: 22,500
Bosnia: 267, 000
Kosovo: 100, 480
Macedonia: 10, 000
The Total Breakdown and Death Toll by War is as follows:
Slovenia: 485
Croatia: 201, 626
Bosnia: 974, 888
Kosovo: 211, 157
Macedonia: 11, 845
Furthermore the organizations that did prosecute and murder Romani People are as follows:
Serbia Aligned Forces: 256,000
Macedonian Aligned Forces: 56,000
Kosovo Aligned Forces: 50,500
Bosnian: 35,000
Croatian Aligned Forces: 2,500
This is the list of the percent of people Each Country lost from the War according to "Official" Serbian Documents:
Slovenia:0%
Croatia: 4.2%
Bosnia: 21.5%
Kosovo: 11.3%
Macedonia: 0.6%
Serbia: 0.0%
In total the Former Yugoslavic States lost an average of 6.1% of their population in this timeline.