Interior minister Gerhard Karner said the suspect had alleged ties to the Islamic State group and radicalised himself online within a very short time period.
A man accused of killing a 14-year-old boy and injuring five other people in a stabbing attack in Austria was motivated by "Islamic terrorism", say authorities.
Speaking in Villach, Mr Karner told reporters that he felt "anger about an Islamist attacker who indiscriminately stabbed innocent people here in this city".
Meanwhile, a 42-year-old Syrian man helped prevent the situation from getting worse by driving towards the suspect.
"This shows how closely terrorist evil but also human good can be united in one and the same nationality," Mr Kaiser said.
