The police in Austria are responding to gunshots fired in a secondary school in the southern city of Graz.

Officers are still trying to clarify the situation on the ground and coordinate a response that includes specially-trained COBRA units, Austria’s version of a SWAT team. According to the Austrian public broadcaster ORF, officials have confirmed several dead, including the shooter.

Graz is Austria’s second-largest city and a vibrant, wealthy university town. It last experienced a major mass attack a decade ago, when a man killed three people and injured three dozen more in a vehicular rampage through the city’s streets that ended with him attacking bystanders with a knife. Police said he had a history of domestic violence and that his wife had recently left him.

On Tuesday, police confirmed that their response was focused on a building at a major high school in the north of the city, close to the train station.