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 defense official said the man, 21, was turned down for military service after failing a psychological test. Investigators are asking how he passed another such test to obtain a gun permit.

A shooter opened fire inside a school in Austria’s second-biggest city Tuesday, killing nine people, authorities said. At least 12 others were wounded in the attack, and the gunman later died by suicide in a bathroom in the school in Graz,