18:45 GMT24 February 2020
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    The bang was powerful enough to trigger car alarms and left houses and office blocks shaking, and instantly sparked a debate online over its cause.

    Derbyshire Police have revealed that the loud explosion heard in Derby city and the surrounding countryside area on Thursday morning was a sonic boom caused by a Royal Air Force (RAF) jet.

    According to the authorities, the RAF Typhoon jet triggered the "loud bang" while moving at high speed to intercept an Air India flight from Mumbai to Newark after receiving a "security alert."

    The loud bang, taking place at around 9:50 am local time, caused worried residents to express their concerns online, with Twitter flooded with reports on the ground about the experience.

    Eyewitnesses speaking to local media had similar accounts. One person travelling by bus told Derbyshire Live: "The bus I was on shook. Everyone on the bus is talking about it."

    Others took a more playful attitude, joking that they were hoping that it was an alien invasion, saying the incident would be talked about for years to come in the sleepy central English city, or even arguing with authorities and claiming the blast was actually caused by a meteor explosion.

    The RAF later confirmed that a Typhoon was launched from the RAF Coningsby base to intercept and escort the Air India flight to Stansted airport, saying it had been "authorised to transit at supersonic speed for operational reasons," and adding that "any inconvenience caused to local residents is regretted."


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