Detectives are examining a claim Madeleine McCann's body may be buried near the holiday apartment from where she vanished.
Self-styled investigator Stephen Birch has said ground radar scans he took in Praia da Luz last week show a burial site.
He has passed them on to Scotland Yard.
Five years on from her disappearance, Madeleine's parents Kate and Gerry McCann believe she is still alive.