Austria plans to tighten its gun control rules after a 21-year-old killed 10 people then killed himself in the country's worst school shooting by far, the conservative-led government said on Wednesday.

Investigators say a former student who killed nine students and a teacher in Austria a week ago and then took his own life had become fascinated with school shootings in recent years.

Austria ranks among the highest in Europe for civilian gun ownership, with approximately 30 guns per 100 residents, according to the 2017 Small Arms Survey, a Geneva research group. While countries such as Cyprus, Finland, and Iceland report slightly higher rates, Austria remains an outlier in the continent.