Hundreds attended a mass after a former student opened fire at a school in Austria’s second-biggest city on Tuesday.

Ten people were fatally shot and many were injured before the shooter took his own life, authorities said.

Austrian Chancellor Christian Stocker described Tuesday's school shooting in Graz as "the darkest day in the history of our country."

Speaking at a news conference, he said it was "a national tragedy that has deeply shaken us."

There was no immediate information on the motive of the 21-year-old man, who wasn’t previously known to police.

He had two weapons, which he appeared to have owned legally, police said.

Special forces were among those sent to the BORG Dreierschützengasse high school, about a kilometer (over half a mile) from Graz’s historic center, after a call at 10 a.m.

At 11.30 a.m., police wrote on social network X that the school had been evacuated and everyone had been taken to a safe meeting point.

Authorities said the assailant was a 21-year-old Austrian man who had two weapons, which he appeared to have owned legally.

Police said they didn’t immediately have information on the man’s motive.

Stocker said there would be three days of national mourning, with the Austrian flag lowered to half-staff and a national minute of mourning at 10 a.m. Wednesday.

AP video by Philipp Jenne