Dozens of people in and around Leicester have reported hearing an explosion or a sonic boom overhead.
There are suggestions it was heard as far away as Oxford.
The loud bang led to a swift reaction o social media as people speculated about the cause.
Twitter user Dr Jon Sutton said: “Massive boom heard over a wide area of Leicestershire. Aircraft, or meteor?”
Naomi tweeted: “Anyone in Leicester know what the hell that massive explosion was?? It shook our house and the birds are going crazy.”
Leicestershire police said: “We have received numerous calls in relation to a large explosion sound heard from various parts of the city and county.
“We like to reassure you that there is no concern however thank you for your immediate response to us.”
