Austria has declared three days of national mourning following what appears to be the deadliest attack in its post-World War II history.

"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 21-year-old man, Arthur A., committed Austria's deadliest school shooting in Graz, killing 10 before turning the gun on himself. Investigations reveal his introverted nature and obsession with online shooting games.

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

Artur A, 21, carried out the worst school massacre in Austria's history yesterday when he started shooting students at a school in Graz, where he had reportedly been the target of bullying

King Charles and Queen Camilla have sent an emotional message to Austria following the shooting rampage in Graz.

The King has sent a message to the people of Austria expressing his sympathy following the “appallingly tragic” school shooting in Graz. Charles described how the “horrific attack” was all the more dreadful because “schools should be places of sanctuary and learning”.

The King and Queen have shared an emotional statement to the victims and families affected by the school shooting in Austria that has claimed the lives of 11 people