Stink bomb attack halts Freiburg tram as four suspects flee scene
A foul-smelling substance disrupted a tram in Freiburg on Tuesday evening, March 31, 2026. The incident occurred just after 7:45 p.m. at the Bertoldsbrunnen stop on line 1, prompting a police investigation. Authorities suspect four individuals sprayed the substance before fleeing the scene. Passengers on the tram reported an intense odour resembling butyric acid, a compound known for its sharp, pungent smell. Police later confirmed the description, noting that even low concentrations of such substances can cause nausea and irritation. Despite the disruption, the tram resumed its journey shortly after the incident.
No injuries were reported, and the vehicle suffered no damage. However, the Freiburg-Nord police station has urged witnesses to step forward with any information. The attack follows a pattern seen in recent years across Germany, including similar incidents in Berlin (2023), Hamburg (2024), and Cologne (2025), where butyric acid was used in acts of vandalism or protest. The substance's volatility—capable of triggering strong reactions at just 1-10 parts per million—has made it a recurring tool in such disturbances. Investigators are now reviewing security footage and witness accounts to identify those responsible.
The tram returned to service without delay, and no lasting harm was caused. Police continue to gather evidence, focusing on the four suspects who fled after spraying the substance. Anyone with details about the incident has been asked to contact the Freiburg-Nord station immediately.
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