Overview
- Police stopped a German-registered car at the Rheinfelden autobahn crossing following a Schengen-system alert and deployed explosive-detection dogs during a targeted inspection on Wednesday, September 9.
- The dogs reportedly signalled positive twice, which led authorities to close the A861 in Germany and the A3 in Switzerland and to call in German explosive-ordnance specialists for a full technical check.
- Two male occupants of the vehicle were taken into provisional custody by police during the multi-hour operation; officials have not publicly clarified their longer-term custody status.
- Specialist teams later reported that no dangerous substances were found and the border was reopened around 20:00, leaving open why the dogs had alerted and whether trace contamination or another cause was involved.
- The shutdown caused long, kilometer-long traffic jams on both sides of the bridge that links the A98 and the Swiss A3, and authorities said the incident shows how Schengen alerts and detection dogs can trigger major cross-border responses that require technical follow-up.