Ten people have been killed during a shooting at a secondary school in the Austrian city of Graz.

BBC News reported the Interior Minister confirmed that six females and three males are among the victims, and the 21-year-old the suspect, who police believe killed himself in a school bathroom.

He added that 12 others have also been wounded.

Authorities say the suspected gunman was a former pupil from Graz who did not finish school and used two legal firearms.

Austrian Chancellor Christian Stocker announced three days of mourning across the country, calling the shooting a national tragedy.