Madeleine McCann’s primary suspect has made a sick taunt in a letter about the police investigation into the British three-year-old’s disappearance.

Christian Brueckner, 48, boasted that police don’t have evidence to pin allegations against him as the German, who was convicted of rape in 2019, is set to be released from prison in September.

He gloated about how the dropping of the probe “will hit the world like a bomb”.

In the newly unearthed letter, written from his prison cell, he wrote: “Is there a body? No, no no.”

Madeleine McCann’s primary suspect has made a sick taunt in a letter about the police investigation into the British three-year-old’s disappearance

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It comes after German police concluded a three-day search for forensic evidence in Praia da Luz, Portugal, near the villa where the toddler was staying before she mysteriously disappeared in 2007.

The search, which was ultimately unsuccessful, was branded “a waste of time” by the head of the German force.

Rainer Grimm, boss of the BKA, Germany’s equivalent of the FBI, appeared to have little confidence in the scrubland search, told a friend who wished him luck: “Thanks, we need it.”

Brueckner, who denies any link to the 18-year-old mystery, insists there is no evidence against him to tie him to the investigation.

Madeleine McCann disappeared during a family holiday in 2007PA

In a letter seen by The Sun, he claimed the “important” and “decisive” questions about his involvement in Madeleine’s disappearance have been left unanswered.

He questioned if his vehicle was “clearly” spotted at the time of the crime and if his DNA or “an injured person” had been found.

He added: “Are there other traces/DNA carriers of the injured party in my possession? Photos?

“And, not to forget, is there a body/corpse? All no, no no.”

Brueckner pointed out that under the law, the prosecution would have to prove his guilt, rather than he prove his innocence and suggested the investigation “will be dropped”.

Portuguese and German officers packed up their equipment at 5pm on Thursday after scouring the area between the resort and a cottage where Christian Brueckner lived at the time of Madeleine’s disappearance in 2007PA

He wrote: “Even the slightest doubt leads to an acquittal, if there is a court hearing at all.”

The sex offender also alleged the allegations against him have been built on “purchased witnesses”.

Despite his denial, German police are adamant convicted rapist and paedophile Christian Brueckner took part in the disappearance of the young Briton.

The sex offender became the primary suspect of the case after disturbing clues were discovered at the 48-year-old’s abandoned lair in Germany, as the probe into Madeleine’s disappearance intensified in May.

Documents, pictures, children’s swimming costumes and toys were reportedly uncovered at a former box-making factory he bought in 2008, a year after the British girl was last seen.