And though some passers-by say the odd noise was so loud it could even be heard on the street, no-one could work out what was causing it.
So when officers arrived at the scene and were unable to get any response from the 23-year-old who lived there, they smashed the door down.
And at that point they discovered what had been buzzing away… a sex toy vibrator which had turned itself on and was rattling around on the wooden floor.
After 'neutralising' the offending device the cops left the scene and the woman will return home to find a bill for the smashed door… and some strange looks from her neighbours