The identities of six of the 11 potential witnesses being interviewed in Portugal over missing Madeleine McCann have yet to be made public.
Those we do know include Robert Murat, a Brit who was the first person to be declared a suspect but was never arrested or charged, his wife Michaela Walczuch and her ex-husband Luis Antonio.
Joaquim Marques was today interviewed for the third time while British police sat in.
While Mario Marreiros, who worked at the Ocean Club hotel where Madeleine's family were staying, claims he saw a man acting suspiciously.
ITV News reporter Rebecca Barry has this report:
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