Residents in canton Valais were given a jolt on Wednesday afternoon as a loud bang reverberated around the canton.
Social media was ablaze with theories, the favourite one being the truth - sonic bangs.
The Air Force says two planes broke the sound barrier as part of an exercise.
A spokesman says they try to carryout supersonic flights at altitude to limit the noise, but weather conditions don’t always allow for that.
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Good news for household bills
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