Austria has announced three days of national mourning following a horrific mass shooting at a high school in Graz, where a 21-year-old former student killed 10 people, including eight students and a teacher, before taking his own life. The attack, described by Chancellor Christian Stocker as a “dark day” in Austria’s history, has left the nation in shock. Authorities have yet to determine the motive, while tributes pour in from across Europe. Schools, officials, and citizens mourn this devastating tragedy.