"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.

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

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.

A 21-year-old former student, named Arthur A. by the local media, shot and killed 10 people at a high school in Graz, Austria, before taking his own life. It is one of the deadliest school shooting in the country’s history.

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

Not long afterwards in south-east Austria, a 21-year-old who had dropped out of school three years earlier, walked into Dreierschützengasse high school in Graz at 09:43, and shot dead nine students and a teacher with a Glock 19 handgun and a sawn-off shotgun.

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.