What we know about Austria school shooting

A deadly school shooting in Austria resulted in the death of nine students and one teacher at Dreierschützengasse secondary school in Graz. The gunman, a 21-year-old former student, also took his own life. The incident, Austria's deadliest mass shooting in recent history, has led to the country declaring three days of mourning. Police are investigating the shooter's motive and have found a "farewell letter" and other concerning items in his home.