How did the Austrians react after the archduke of Ferdinand was killed?

After the assassination of Archduke Franz Ferdinand of Austria on June 28, 1914, Austria-Hungary reacted with a mix of outrage and determination for retribution. The Austro-Hungarian government, seeking to assert its authority and quell nationalist movements, issued an ultimatum to Serbia with harsh demands. When Serbia's response was deemed unsatisfactory, Austria-Hungary declared war on Serbia on July 28, 1914, setting off a chain of events that led to the outbreak of World War I. This reaction highlighted the tense political climate in Europe and the fragile alliances that would soon escalate into a global conflict.