Hans Christian Wolters will not reveal the evidence as he says it would jeopardise his investigation into the suspect.
He told the Mail:"We have been quite clear throughout we are investigating a murder and we have the evidence for that.
The McCanns' spokesman Clarence Mitchell said the family would not discuss private correspondence and it wasn't clear if they had yet received the prosecutor's letter. He told Sky News:"People with a criminal background don't deal readily with the authorities, but I appeal to such friends of the suspect to tell anything they know.
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