Austria has declared three days of national mourning following what appears to be the deadliest attack in its post-World War II history.

A school shooting in Graz, Austria on Tuesday left nine people dead, officials said, as well as the suspected attacker who is believed to be a student.

A former student who never graduated opened fire this morning in Graz, Austria. At least 10 people were killed and 11 injured. Police say the shooter used two weapons that he legally owned and took his own life in the school's bathroom.