Speaking to ORF radio, Stocker said officials aimed to set stricter eligibility rules for possession and purchase of arms after a 21-year-old Austrian man on Tuesday shot dead ten people at a high school in the city of Graz before killing himself.

Ten people were killed in a mass shooting at a high school in Graz, the country’s second-largest city, the police said. The gunman also died, in an apparent suicide.

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