Austrian authorities are searching for answers about why a 21-year-old gunman killed 10 people at his former high school before killing himself, triggering one of the deadliest attacks in the country's modern history.
Among those killed in Tuesday's attack was a girl of Kosovo origin.
Police said the attacker, armed with a shotgun, acted alone.
Security authorities are searching the attacker's home and online activity for any clues that could provide answers to why he carried out the attack on the school in Austria's second-largest city, Graz, before killing himself in a bathroom.
"It's very difficult to understand this event," said Paul Nitsche, a religious studies teacher at the school, who left his classroom before the attacker tried to enter, and briefly saw him trying to pick the lock on another door.
"This is something I could never have imagined before. As I was running down the stairs, I thought to myself: 'This isn't true,'" he told national broadcaster ORF.
Several Austrian media outlets have reported that the young man, who has not yet been identified, appeared to be feeling bullied, but police have not confirmed this. Austrian authorities said he never finished his studies at the school.
He left a suicide note, which police say does not reveal a motive for the attack. A homemade bomb found in his home was also found to be inoperable.
Franz Ruf, the director general of public security, said investigations into the motive were being carried out rapidly.
"We don't want to speculate at this point," he told ORF on Tuesday evening.
Austrian police said the victims were found inside and outside the school, on different floors. Dozens more were injured in the attack, some seriously.
Austria declared three days of national mourning on Tuesday after the attack.
The incident sparked a rare wave of solidarity between political parties, usually deeply divided in their positions. Parents of the students and residents near the school are struggling to understand what happened.
Hundreds of people gathered on Tuesday evening in Graz's main square to pay their respects to the victims. Others laid flowers and lit candles near the school. Dozens of people lined up to donate blood for the survivors./ REL (A2 Televizion)
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