A chief scientist claims a loud bang on the north Cornwall and Devon border was caused by a large meteor exploding.
David Carcary from the West Cornwall Astronomical Society said a meteor had created the sonic boom before burning up after it entered the atmosphere.
He said the lack of any seismological signals indicates it burned up before it hit the ground.
Residents in the Bude and Holsworthy areas had reported hearing a loud bang around midday on Thursday.
One resident in Bude said a crack in her kitchen had widened as a result, while others reported experiencing their properties "shaking".
A BBC Radio Cornwall listener said: "The stables physically shook. It sounded like Concorde used to sound when it broke the sonic barrier. But much louder. It went 'boom, boom'."
BBC NEWS | England | Cornwall | 'Meteor' caused mystery explosion