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.

Austria to observe three days of mourning after a 21-year-old attacker kills at least 10 people at a school in Graz.

"I think the first thing is shock, to be honest. I think you can't react the other way. I think everyone in the school is in complete shock," said 24-year-old student Helene Parr, who knows people at the BORG Dreierschützengasse school, where the mass shooting took place.

A lone attacker has shot dead 10 people at a school in the Austrian city of Graz. Officials say the suspect, who was 21 and had two guns, killed himself in the bathroom. Three days of national mourning have been announced.

Residents of Graz gathered for a mass and a candle lit vigil to mourn the 11 victims who were killed after a former pupil opened fire in a school. View on euronews

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.

The deadliest school shooting in the nation’s recent history has prompted some gun enthusiasts to worry about the prospect of stricter ownership laws.

A debate about gun laws in Austria is gathering pace after a 21-year-old former student killed 10 in a shooting at a school in Graz on Tuesday. View on euronews

Police in Austria were hunting for clues on Wednesday after a gunman opened fire at his former high school a day earlier, killing nine students and a teacher in a deadly spree that stunned the country.