The operation commenced shortly after 9:00 PM. When emergency services arrived, alongside the police – which included local units and special units such as Eko Cobra and WEGA – professional rescue and firefighters were also alerted. The unidentified individual had likely barricaded themselves in the apartment.
Negotiators attempted to establish contact with the man through a negotiation team, but communication proved difficult as there was little verbal interaction, despite attempts to speak to him in several languages through the front door. The presence of other individuals behind the door could not be ruled out.
The night unfolded with uncertainty as shots were fired and an explosion occurred, leading to a fire that was extinguished by firefighters. The explosion’s origin remained unclear, with speculation that it could have been triggered by the man or be a gas explosion caused by manipulation.
Initial investigations suggested the man may have stockpiled explosives, but a subsequent search yielded no evidence of these. The theory of a gas explosion became more likely as the night progressed.
The investigation confirmed that the suspect was alone in the apartment, dispelling earlier rumors of a hostage situation.
“We treated seven lightly injured individuals and hospitalized them,” reported Corina Had, a spokesperson for the professional rescue service. Initially, reports indicated six injured persons, but this was later revised to seven. In total, 20 people received assistance from emergency services at the scene, with 12 released to home care and one fatality.
A large area surrounding the operation site was cordoned off during the night. The police reported that the 16th district’s Klausgasse area was widely closed off, urging the public to avoid the area and follow the instructions of responding forces.
Throughout the morning and early afternoon, firefighters continued to provide support, securing the scene and stabilizing the building. The City of Vienna’s emergency response office was also on site to assess damage and determine whether residents could remain in the building or be evacuated.