German law enforcement authorities have voiced alarm that the "dangerous" chief suspect in the 2007 disappearance of British toddler Madeleine McCann will soon leave prison and could flee the country.

Prosecutors believe Christian Brueckner, 48, killed the three-year-old girl in a Portuguese resort in a missing persons case that has captivated the world and remains unsolved.

But lacking sufficient evidence to lay charges, they are helpless as Brueckner -- who has a history of violent sex crimes -- is due to be released from a German prison by September 17.

The chief prosecutor in the case, Christian Wolters, told AFP that he believes the man who German authorities refer to as Christian B. remains "fundamentally dangerous".

A psychiatric expert who assessed him recently concluded that "

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