A source close to Madeleine McCann's parents has told ITV News that they are "aware" Portuguese police are investigating the possibility a former employee at the hotel in Praia de Luz where the family were staying may have kidnapped her.
It is understood the 40-year-old man died in a tractor accident in 2009 - two years after Madeleine disappeared.
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The little boy cried for help but began making the two-mile journey home on his own when there was no response.