At least eight people were killed and several others injured in a school at a school in the Austrian city of Graz, news agency Reuters reported, citing local media.

The suspect, reportedly a student, is believed to have killed himself, UK-based Independent reported citing Austrian state media ORF.

Police said a major operation was underway in the city since 10 am after gunshots were heard inside the school.

Students and teachers were among those seriously injured in the shooting, according to ORF.

According to Austrian police, the operation was ongoing in a street, on which a secondary school is located. The building was being searched by authorities and the area was cordoned off.

The husband of a teacher who is barricaded in a classroom with her students during the shooting said his wife had several gunshots, Krone newspaper reported.

Parents of students who escaped were allowed to see their wards while the injured were being given medical attention.

The shooting occurred ahead of the tenth anniversary of the Graz shooting on June 20, 2015, which left three people dead.