A 21-year-old former student opened fire inside his school in Austria’s second-biggest city Tuesday morning and killed 10 people.

Police have revealed chilling details about what they found in the home of a former student, 21, who is suspected of leaving a farewell message for his mom before killing 10 in the school shooting in Graz,

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, authorities said Tuesday, killing nine people including teenagers in one of the worst rampages in the country’s history.

At least nine people were reported killed and a number of others injured in a shooting at a school in the southern Austrian city of Graz on Tuesday, the city's mayor said.

Ten people were killed in a mass shooting at a high school in Graz, the country’s second-largest city, the police said. The gunman also died, in an apparent suicide.

Eleven people injured in a school shooting in Graz, Austria, on Tuesday are still being treated but are not in life-threatening condition, officials said.