Officials in Austria say a school shooting has left at least 10 people dead in the European nation's second-largest city, Graz. The shooter is also dead.

A shooter opened fire at a high school in the Austrian city of Graz on Tuesday, killing 10 people, including teenagers, in one of the worst rampages in the country’s history.

Austria will observe a national day of mourning and a minute's silence on Wednesday after a former student shot dead 10 people at a high school in an unprecedented case of gun violence that stunned the Alpine country.