The prime suspect in the high-profile case of Madeleine McCann's disappearance has been released from prison in Germany, where he has been serving a sentence for an unrelated offense.

Christian Brückner was driven out in a black Audi by his lawyer with a police escort shortly after 09:00 local time (07:00 GMT). Brückner wasn't visible in the car but police confirmed he had left Sehnde prison.

He had been convicted of raping a 72-year-old American woman in Portugal in 2005, and will be fitted with an ankle tag after his release from the prison near the northern city of Hanover.

The German national, 48, has never been charged with any crime in relation to the McCann case. He denies any involvement.

Local police spokesman Lars Dehnert told the BBC: We said before that we wanted this to happen as smoothly as possible, adding that Brückner would be escorted for a short distance.

One of Brückner's lawyers, Philipp Marquort, commented that Brückner is relieved to be out, but noted that he needs to settle down before his next court appearance.

The Metropolitan Police in the UK continue to consider Brückner a suspect; his investigation remains an open missing person inquiry. Madeleine McCann vanished when she was three years old in 2007, while her parents dined at a nearby restaurant.

Despite considerable police investigations, including searches in Portugal that have yielded no breakthroughs, Brückner's name remains linked to the case due to circumstantial evidence. Prosecutors have expressed concerns that Brückner might flee.

As part of his strict release conditions, Brückner will wear an electronic ankle monitor for five years, must report to a probation officer monthly, and requires court approval for any change of residence.