Investigators for the McCann family are probing claims that a girl calling herself Maddy was seen in Amsterdam in June 2007.
The move comes after new information on Madeleine's disappearance was made public by Portuguese police.
The files also contained CCTV images showing a small child said to resemble Madeleine at an Algarve petrol station the day after she went missing.
Sabet Choudhury reports.
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