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.

Officials say the former student who killed nine students and a teacher at a school in Austria and then took his own life planned the attack in detail.

At least 10 people are dead following a mass shooting at the BORG Dreierschützengasse high school in Graz, Austria, according to state police.Among the dead were eight students, one adult, and the suspected gunman in the deadliest mass shooting in Austria’s postwar history.