The disappearance of Madeleine McCann could be 'solved in months', investigators have said.
German prosecutor Hans Christian Wolters has revealed that new information from witnesses could be vital in an eventual conclusion.
Speaking about the progress being made, he said that the public would be informed of any 'further details'.
According to the Mirror, Mr Wolters said: "We hope we can solve the disappearance of Madeleine McCann, although this will take several months.
"We are pleased with the response to our appeal for witnesses. But unfortunately not all our questions have been answered."
Adding: "When we have completed our investigations, we will inform the public about the result and then also about further details."
Investigators in Germany recently said that they had been looking into the prime suspect in the young girl's disappearance for the past four years.
The man, known as Christian B, was revealed to the public as being of interest last year.
However, Mr Wolters told Sky News authorities were already investigating him and had 'built up a fact file' before reaching out to the public for help.
He said: "By that time Christian B had been under investigation already for three years. We did not take the decision to go public lightly.
"Since then we have found a lot more pieces of the puzzle, but I cannot reveal what they are. We are making progress and have the same number of investigators working on the case, but we don't yet have enough to charge the suspect."
He added: "There is no time limit to our investigation, but we won't keep it going forever."
Christian B, 43, is reported to have been living in Portugal at the time of Madeleine's disappearance in 2007.
His mobile phone was also found to be in use nearby and the day after her disappearance Christian B changed the registration of one of his vehicles.
And he is also alleged to have confessed to a criminal associate, who was later arrested and told Scotland Yard about the confession.
A clairvoyant contacted the police last week, claiming that Madeleine was dead and buried six miles from the hotel where she was staying in Praia da Luz at the time of her disappearance.
Michael Schneider - who has successfully located a number of missing people - passed on the exact co-ordinates of the area he believes officers will find her.
While many people might be sceptical about the clairvoyant's claims, Mr Wolters is not.
He told the Sunday People his officers have used clairvoyants in the past and, in some cases, received specific information.
Featured Image Credit: PA
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