Analysis of information sources in references of the Wikipedia article "Primeira Guerra Mundial" in Portuguese language version.
Following the assassination of Franz Ferdinand in June 1914, Croats and Muslims in Sarajevo joined forces in an anti-Serb pogrom.
... the assassination was followed by officially encouraged anti-Serb riots in Sarajevo ...
... arrested and interned some 5.500 prominent Serbs and sentenced to death some 460 persons, a new Schutzkorps, an auxiliary militia, widened the anti-Serb repression.