Why would TWO border checks be performed for the same bus upon entering Switzerland?

Why would TWO border checks be performed for the same bus upon entering Switzerland? - Man in Black Jacket Standing Entering a Bus

Yesterday I went by bus from the Euroairport (French sector) to Zurich. Unusually, two Swiss border checks took place.

First, at the St-Louis border checkpoint, officials boarded the bus, asking foreigners (including me) where they were going, for what purpose and for how long, and collecting all passports for scanning. This check took 30 minutes.

10 minutes after leaving the border, the bus stopped at the scheduled bus stop in Basel, where a mobile team of officials boarded with portable passport devices. They scanned all passports and visas and checked entry/exit stamps. Myself I was asked where I was going, where in Switzerland I live, for what purpose I live there, where I was travelling from and for how long I'd been there. This check took 15 minutes.

How come the same authority (the Grenzwache) would check the same bus twice, given that no passengers can get on/off the bus between the border and the bus stop in Basel?






Pictures about "Why would TWO border checks be performed for the same bus upon entering Switzerland?"

Why would TWO border checks be performed for the same bus upon entering Switzerland? - Man Dancing on Pedestrian Crossing Near Bus
Why would TWO border checks be performed for the same bus upon entering Switzerland? - Full body side view of fearless bearded male jumping off concrete border near brick walls on street during sportive training
Why would TWO border checks be performed for the same bus upon entering Switzerland? - Full body of unrecognizable male riding on skateboard on railing near sea under bridge during training on seaside in city





Italy to Switzerland's border crossing|ITALY to SWITZERLAND|Italy-Switzerland border crossing by Car




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Faruk Tokluoğlu, Thiago Miranda, Mary Taylor, Allan Mas