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https://en.wikipedia.org/wiki/Bulgarian_occupation_of_Serbia_(World_War_I)#International_response_to_Bulgarian_war_crimes
>The reports of the commission in Eastern Macedonia summarised the violations of the Hague Conventions: the massacre of the civilian population, torture, rape, internment, punitive economic expropriation, requisitions, and various taxes, plunder, forced labor, destruction, arson, and other actions aimed at destroying the Serbian presence in the newly occupied territories.
>We can affirm that there is not a single article of the Convention of The Hague or principle of international law that the Bulgarians did not violate.
>At the Peace Conference of 1919, the Commission on the Responsibility of the Authors of the War and on Enforcement of Penalties, a precursor of the United Nations War Crimes Commission, was created. The Commission organized war crimes "against the laws of war and humanity" into thirty-two specific classes including: "massacres, rapes, deportations and internments, tortures and deliberate starvation, forced labour and systematic terrorism".
https://en.wikipedia.org/wiki/Surdulica_massacre
https://en.wikipedia.org/wiki/%C5%A0tip_massacre
https://en.wikipedia.org/wiki/Koko%C5%A1inje_murders
https://en.wikipedia.org/wiki/Alexander_I_of_Yugoslavia#Assassination
>The Documents relatifs aux violations des Conventions de La Haye et du Droit international commis de 1915–1918 par les Bulgares en Serbie occupée, a report covering alleged atrocities committed in Serbia published after the war, stated that ‘anyone unwilling to submit him or herself to the occupiers and become Bulgarian was tortured, raped, interned, and killed in particularly gruesome manners, some of which recorded photographically. Bulgarian units that occupied Serbian territories showed extreme brutality, systematically expelling the non-Bulgarian population in the regions they occupied, they arrested the population and set the rebel villages on fire