Christian Brueckner is the prime suspect in Madeleine McCann’s disappearance

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A German paedophile suspected of abducting and murdering Madeleine McCann has spoken for the first time since he was named a suspect.

Christian Brueckner, 44, has reportedly written a letter slamming the investigation a "scandal", proclaiming his innocence and urging prosecutors leading the case to give up.

He accused prosecutors of bringing "shame" to the German legal system by making "scandalous" statements against him without ever bringing charges in connection with Madeleine's disappearance.

The letter, dated May 8, reportedly was accompanied by a bizarre drawing of two prosecutors ordering "filet forensics" at a restaurant.

Bruckner was last year named the prime suspect in the case, which German prosecutors are treating as a murder investigation.

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This bizarre sketch showing two prosecutors ordering food at a restaurant was included with the letter
(Image: BILD Fotoservice)

Madeleine went missing from her family's holiday apartment in Praia da Luz, Portugal, just days before her fourth birthday in May 2007.

Her parents Kate and Gerry had put her and her siblings to bed in the flat before joining friends for dinner at a tapas restaurant nearby.

Madeleine was gone when they returned and has never been found.

German prosecutors claim they have evidence Madeline is dead and they suspect she was abducted and murdered by Brueckner, who has not yet been quizzed.

The letter written by Brueckner was dated May 8 and obtained by a German tabloid
(Image: BILD Fotoservice)

Madeleine vanished from her family's holiday flat in Portugal days before her fourth birthday
(Image: PA)

German tabloid Bild reported on Monday that it had obtained a letter written by Brueckner.

He said prosecutors should resign for "persecuting an innocent person".

Brueckner, previously convicted of sexually abusing two young girls in Germany, called the investigation a "scandal" and attacked prosecutors for making statements about him to the press.

He wrote that prosecutors were "unsuitable for office" and "bring shame to the German legal system", Bild reported.

The letter was accompanied by a drawing of prosecutors ordering food in a restaurant.

In speech bubbles in the drawing, one of the characters says "I'll take the filet forensics" and the other replies "Yummy, me too".

It is a possible reference to the fact that investigators have previously admitted they have no forensic evidence in the case.

Brueckner, who is currently in prison, wrote in the letter: "Charging an accused is one thing.

Parents Kate and Gerry McCann have said they will never give up looking for Madeleine
(Image: Getty)

The McCanns were staying at this holiday complex when Madeleine vanished
(Image: Phil Harris)

"Something completely different – namely, it is an unbelievable scandal – when a public prosecutor starts a public campaign for prejudice before a court case is opened.

"Freedom of expression is not a basic right so that everyone can say and write what they want. Freedom of expression does not protect the majority.

"It protects the minority. It does not protect the most logical, most convincing or most popular views, but rather the outsider position.

"I call on the Brunswick public prosecutors (Hans Christian) Wolters and (Ute) Lindemann to resign from their offices.

"Both are proving worldwide through my arbitrary condemnation in the past and through their scandalous pre-denial campaign in the present against me as an innocent person that they are not suitable for an office as a lawyer for the honest and trusting German people and you bring shame onto the judiciary."

Brueckner is in prison in Oldenburg, near Bremen, after being sentenced to seven years for raping an elderly woman in her home in Praia da Luz in 2005.

It is the same resort where Madeleine, from Rothley, Leicestershire, went missing about 18 months later.

Earlier this month, prosecutor Hans Christian Wolters told the Mirror he was "pleased" with how the case has progressed and it could be solved in months.

Mr Wolters said prosecutors still had unanswered questions, however.