Austria’s chancellor says his country will toughen its gun laws after a 21-year-old former student killed nine students and a teacher at his school last week in what’s considered the Alpine country’s deadliest post-war attack.

A gunman who opened fire and killed 10 people before taking his own life in a school in Austria was a former student of the college, police have confirmed. Authorities said the gunman, a 21-year-old Austrian national, opened fire at the BORG school in Graz just after 10am local time.

Police identified the suspected shooter as a 21-year-old from Graz, adding that he appeared to have died by suicide.