A German child murder may be questioned by cops over Madeleine McCann

The 32-year-old, known as Silvio S, confessed to killing two children after he was arrested last week.

Police in Germany are also said to be making enquiries into whether he is also responsible for the disappearance of a five-year-old girl Inga Gehricke branded the German Madeleine McCann after she vanished from a family barbecue about 50 miles from Berlin in May this year.

They are known to be looking into possible links to other possible children.

The suspect was arrested on Thursday. The body of a child was found in his car.

It is thought to be that of Mohamed Januzi, who was kidnapped from a refugee registration centre in Berlin.

A photo, candles, toys and flowers stand at a makeshift memorial to four-year-old Mohamed Januzi near the site where he was abducted several weeks ago in Berlin, Germany

Silvio S reportedly said he had buried six-year-old Elias in an allotment. The fate of the little boy, who disappeared without a trace from outside his home in Potsdam, had made headlines across Germany.

Madeleine was just three years old when she went missing while on holiday with her parents Kate and Gerry in Praia Da Luz in May 2007.

Reports in Germany suggest Scotland Yard have been in touch with their German counterparts to see if Silvio S was in Portugal at the time.

Silvio S, who was born in the former communist state of East Germany and worked as a tiler, would have been 24 at the time.

Former police psychologist Adolf Gallwitz feared that further deaths cold come to light during the investigation.

"We're talking about the end of a series, " he said.