German police have completed a search of an allotment that a neighbouring plot owner said was previously rented by the main Madeline McCann suspect.
The allotment owner told the BBC that the suspect, Christian B, arrived there the year Madeleine went missing.
German prosecutors said the two-day search near Hanover was related to the investigation into Christian B, a sex offender in prison in Germany.
Police left the site, which once had a shack with a cellar, on Wednesday.
Madeleine was three years old when she went missing while on holiday with her family in Portugal 13 years ago.
The British girl disappeared from an apartment in Praia da Luz on the evening of 3 May 2007, while her parents were with friends at a nearby tapas bar. It sparked a huge police hunt across much of Europe.
The man whose allotment neighbours the one being searched told the BBC that Christian B rented the plot for a few months in the year Madeleine went missing.
The man said Christian B arrived in the spring or summer of 2007 and told him he wanted to insulate a small shack which stood on a concrete base in the garden with a small cellar underneath.
The neighbour went on holiday in July 2007. When he returned in August,