Freed after serving a prison term for rape, Christian Brueckner walked out of a German jail on Wednesday still under suspicion – though never charged – in the long-running investigation into Madeleine McCann’s disappearance.

The top suspect in the 2007 disappearance of British toddler Madeleine McCann in Portugal was freed from a German prison on Wednesday.

Christian Brueckner, 48, who had finished a seven-year jail term for rape, has not been charged in the McCann case because of a lack of evidence, prosecutors say.

He was driven out of the Sehnde prison in northern Germany in the back of his lawyer's car which then sped off, joined by two police vans, AFP journalists and a prison official said.

Brueckner will have to wear an electronic ankle bracelet and regularly report to probation officers, reported Der Spiegel news magazine, adding that his passport was taken away and the validity of his ID card restricted to German soil.

Local justice officials did not immediately reply to AFP requests for confirmation of the reported conditions of his release.

Prosecutors in the city of Braunschweig have accused Brueckner of being behind the disappearance of McCann, widely known as "Maddie" -- the notorious missing person case which has captivated the world media for years.

Three-year-old Madeleine vanished from her family's holiday apartment in Praia da Luz in May 2007 while her parents dined at a nearby tapas bar.

However, a lack of solid evidence prevented them from laying charges against Brueckner, who denies the claims against him.

This meant that on Wednesday he was a free man, having finished his sentence for raping a 72-year-old American woman in 2005 in Portugal's Algarve region, where Maddie went missing.

Despite a huge international manhunt, global media attention and multiple leads that went cold, no trace of her has ever been found and no one has been charged over her disappearance.

German prosecutors in a bombshell announcement in 2020 named Brueckner, who is known to have lived in the area on and off at the time, as their top suspect.

RTL

Maddie McCann at the age of three, on the left, and an 'age progression' image of what she may have looked like at age six, released in 2009 / © AFP/File

They have said they have unspecified but "concrete evidence" that was nonetheless not enough to secure a conviction, and have therefore refrained from charging him over the Maddie case.

In June, police combed an overgrown area and abandoned buildings in Portugal near where Brueckner lived at the time, but without so far announcing that they have found any evidence.

- 'Top league of dangerousness' -

Days before Brueckner's release, Braunschweig chief prosecutor Christian Wolters warned that he remains "dangerous" and was considered likely to reoffend.

RTL

Brueckner was driven out of prison, flanked by police vans and watched by a large group of media / © AFP

Wolters, in an AFP interview, also voiced fears that Brueckner might leave Germany "because of all the media hype".

Brueckner's defence lawyer Friedrich Fuelscher told public broadcaster NDR that the comments by the public prosecutor's office "will have an impact on his future life".

He predicted Brueckner might struggle to find a job or a flat and to reintegrate into society because "people will not want to have any kind of contact with a suspected child murderer".

Brueckner was first convicted of sexually abusing children when he was still a teenager, according to Der Spiegel.

By 2020, his criminal record contained 17 entries, the magazine reported, including causing bodily injury, theft and drunk driving.

RTL

Three-year-old Madeleine McCann disappeared from a resort in southern Portugal in May 2007 / © AFP

During his latest trial, a psychiatric expert described him as being in the "absolute top league of dangerousness" and highly likely to reoffend, according to German media reports.

At the time he was revealed as a suspect in the McCann case, Brueckner was serving a sentence for drug trafficking.

He was also charged in October 2022 with five separate counts of rape and child sex abuse allegedly committed between 2000 and 2017 in the same region of Portugal where Maddie went missing.

But he was acquitted on all charges, thwarting prosecutors' hopes of keeping him in jail while they continued to investigate the Maddie case.

Prosecutors in Braunschweig, where Brueckner was tried on the 2022 charges, have applied for a retrial in a different court, but a decision on those proceedings is not expected before next year.

RTL

The high-security prison at Sehnde where convicted rapist Christian Brueckner had served seven years / © AFP

Wolters said German investigations into Maddie's disappearance were ongoing.

Prosecutors "have not yet evaluated everything" found during the new search in Praia da Luz in June, he said, adding that there are also still "other lines of inquiry".