http://www.bbc.co.uk/news/uk-england-22926813
"Loud explosions" heard across the east of England were caused by a sonic boom when a jet broke the sound barrier.
The noise, at 11:30 BST, caused shaking and smashed windows and prompted calls to police in Cambridgeshire, Essex and Hertfordshire.
The Ministry of Defence said a Typhoon jet from RAF Coningsby in Lincolnshire was launched when communication was lost with a Heathrow-bound plane.
It is understood the plane, travelling from the USA, landed without incident.
Air traffic controllers had become concerned but communication was re-established with the passenger airliner and there were no problems on boar.........................
I heard this myself, was quite loud





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