The cantonal force released a statement saying, "The manhunt for the unknown perpetrator is under way." It added that "Possible motives as well as the exact circumstances of the crime are still unclear." Investigators have not disclosed a suspect description or any timeline for when the gunfire began.
Police and emergency services secured a wide area around the racing track, and cordons also covered the town swimming pool and sports field. Officials urged the public to avoid the zone while officers examined the scene. A large contingent of personnel was deployed beyond Aarau, with police describing that wider presence as a precaution.
Images from the area showed an armoured vehicle blocking a road amid a heavy police presence. In addition to local police and fire crews, the regional disaster response unit, known as KKE, was sent to support operations. Broadcaster SRF reported a Swiss Army helicopter conducting aerial surveys over the scene in the early hours.
The shooting occurred where a rave had been due to run into the early hours of Sunday, and authorities asked anyone who witnessed events or who has photographs or video from the area to come forward. Police said material from bystanders could help clarify how the incident unfolded.
Investigators continue to piece together what happened and why. For now the focus remains on locating the person or persons responsible and on determining whether the attack was targeted or random. Authorities signalled that more information will follow as enquiries proceed and new evidence is assessed.
