A 19-year-old man has been arrested on suspicion of malicious communication following the publication of an offensive Facebook post.
The man, who lives in the London area, is accused of making the post on social media during the inquiry to find missing school girl Amber Peat.
The man was arrested by the Metropolitan Police and is currently in custody.
A misconduct hearing heard the officer text an acquaintance about the discovery of the missing teen's body before it was made public.
Tributes to missing 13-year-old Mansfield girl Amber Peat have been placed close to where a body was found.
Nottinghamshire Police have held a press conference after the disappearance of 13-year-old Amber Peat.