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| Sonic boom heard across Derbyshire caused by RAF Typhoons | Sonic boom heard across Derbyshire caused by RAF Typhoons |
| (32 minutes later) | |
| A sonic boom was heard across Derbyshire as military aircraft were launched to intercept a passenger plane following a reported bomb threat. | A sonic boom was heard across Derbyshire as military aircraft were launched to intercept a passenger plane following a reported bomb threat. |
| Police and the fire service received "a large number" of 999 calls from people who feared there had been an explosion. Some residents said their homes shook. | Police and the fire service received "a large number" of 999 calls from people who feared there had been an explosion. Some residents said their homes shook. |
| Emergency services initially could not explain the cause of the loud bang heard shortly before 10:00 BST. | Emergency services initially could not explain the cause of the loud bang heard shortly before 10:00 BST. |
| The RAF confirmed Typhoon aircraft had been launched. | |
| "The RAF can confirm Quick Reaction Alert Typhoon aircraft were launched this morning from RAF Coningsby to intercept a civilian aircraft," a statement said. | "The RAF can confirm Quick Reaction Alert Typhoon aircraft were launched this morning from RAF Coningsby to intercept a civilian aircraft," a statement said. |
| "The aircraft was safely escorted to Stansted airport. The Typhoon aircraft were authorised to transit at supersonic speed for operational reasons; any inconvenience caused to local residents is regretted." | "The aircraft was safely escorted to Stansted airport. The Typhoon aircraft were authorised to transit at supersonic speed for operational reasons; any inconvenience caused to local residents is regretted." |
| Bob Billington, who lives in Derby, said he heard two bangs in quick succession and guessed it was a sonic boom. | Bob Billington, who lives in Derby, said he heard two bangs in quick succession and guessed it was a sonic boom. |
| "The first bang was rather loud, like the thunder from a very close lightning strike, then rather less than a second later there was a second, not quite as loud, and then the echoes from the surrounding buildings making it sound like a fairly short roll of thunder," he said. | "The first bang was rather loud, like the thunder from a very close lightning strike, then rather less than a second later there was a second, not quite as loud, and then the echoes from the surrounding buildings making it sound like a fairly short roll of thunder," he said. |
| Mr Billington recognised the sound from hearing it at air shows "in the good old days". | Mr Billington recognised the sound from hearing it at air shows "in the good old days". |
| "They aren't allowed to do that any more," he said. | "They aren't allowed to do that any more," he said. |
| "I assume there aren't very many of the people reporting it have actually heard one before, so I can understand their reactions." | "I assume there aren't very many of the people reporting it have actually heard one before, so I can understand their reactions." |
| Derbyshire Police said they had received "a large number" of 999 calls about the noise. | Derbyshire Police said they had received "a large number" of 999 calls about the noise. |
| The RAF said they could not say how many Typhoons were launched "for operational reasons". | |
| They were escorting an Air India passenger plane which made a "precautionary landing" after the airline initially reported a bomb threat. | |
| A statement from Stansted Airport said the plane landed at about 10:15 BST and was now in an isolated part of the airport - and the main terminal is unaffected. | |
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