A 21-year-old former student opened fire inside his school in Austria’s second-biggest city Tuesday morning and killed 10 people.

Austria came to a standstill on Wednesday to mourn victims of one of the worst outbreaks of violence in its modern history, as authorities search for clues to why a 21-year-old gunman shot dead 10 people at his former high school before killing himself.

Officials in Austria say a school shooting has left at least 10 people dead in the European nation's second-largest city, Graz. The shooter is also dead.

At least seven were killed and dozens more were injured in one of the worst such incidents in the country’s history.

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.

GRAZ, Austria (AP) — 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, officials said.

ISLAMABAD: Pakistan has expressed deep sorrow over the tragic shooting at a school in Austrian city of Graz. “We are deeply saddened by the tragic shooting at the secondary school in Graz, Austria, that has resulted in several casualties with many injured,” the Foreign Office spokesperson said.

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.