Content warning: This story mentions sexual assault and may be distressing to some readers.
Update: Portuguese police have apologised to the family of Madeleine McCann for the handling of the unsolved case, more than 16 years after the three-year-old's disappearance.
The BBC reported a delegation of officers travelled from Lisbon to London to apologise for the handling of the investigation and how the family was treated.
The McCanns have not commented on the apology.
At around 8.30pm on May 3, 2007, Kate and Gerry McCann left their three sleeping children in their holiday apartment in the quiet Portuguese resort of Praia da Luz and headed out for dinner.
They thought that Madeleine, three, and 18-month-old twins, Sean and Amelie, would be safe just 83 metres from where they were dining at a tapas restaurant with the group of friends they were holidaying with.
Throughout the evening, the adults took turns checking on the kids.
At 10pm, it was Kate McCann’s turn.
When she arrived at apartment 5A, she knew immediately something was wrong.
Madeleine was gone.
What happened next is well documented. The story of the blonde toddler’s unexplained disappearance became a global news story.