Detectives investigating the disappearance of Madeleine McCann are expected to begin questioning 11 people today.
British police working on the case are believed to have arrived in the Algarve to take part in interviews alongside Portuguese officers.
They will spend three days working on the case alongside their Portuguese counterparts, according to reports.
ITV News' Rebecca Barry, who is in Praia da Luz, says those set to be questioned "include British and Portuguese men and women, including some former members of staff from the Ocean Club, where the McCanns were staying when Madeleine went missing".
The British police delegation is thought to include DCI Nicola Wall, who has taken over the investigation into Madeleine's disappearance from DCI Andy Redwood, who is retiring.
Some 11 people "will be interviewed as witnesses" by the police searching for missing Madeleine McCann, Good Morning Britain heard.
British and Portuguese "men and women" are expected to be quizzed by the police over what happened to the missing youngster.
British police are expected to arrive in Portugal today to question a number of people over the disappearance of Madeleine McCann.
The three-year-old, from Rothley in Leicestershire, went missing from a holiday apartment in Praia da Luz in Portugal in 2007.
Scotland Yard detectives will be expected to interview Robert Murat, who was arrested as part of the Portuguese police investigation into her disappearance at the time.
As well as questioning seven suspects, four other people will be interviewed as potential witnesses.
British police travelled to Portugal over the summer and spent eight days searching three areas of Praia da Luz, but found no new evidence.
British detectives want Portuguese police to apply new techniques to items found in the McCann family apartment in a bid for a breakthrough.Read the full story ›
A woman who was found dead after being accused of directing online abuse against Madeleine McCann's parents has been formally identified as Brenda Leyland.
Police working on behalf of a coroner will now look at the run-up to the death of Brenda Leyland, who was confronted by a Sky News TV crew over her apparent "trolling" of the couple.
She was tracked down to her house in Burton Overy, Leicestershire, and confronted by crime correspondent Martin Brunt in a report televised last week.
A body found in a hotel is believed to be a woman accused of targeting Madeleine McCann's parents with internet abuse.Read the full story ›
A couple face jail today for selling bogus bomb detectors in their garden shed which they said could find missing Madeleine McCann.Read the full story ›
A dossier of online abuse directed at the parents of Madeleine McCann is being examined by police.Read the full story ›
'Organisational arrogance' on the part of different crime agencies hampered the probe into Madeleine McCann's disappearance, according to the author of a previously unpublished report on the investigation.
Jim Gamble told the Guardian: "Each one thought that their agency would bring the best to bear on this. We were all guilty."
He also told Sky News that different agencies trying to make their mark "created a sense of chaos and a sense of competition".
Mr Gamble, the former head of the Child Exploitation and Online Protection Centre, said this had also damaged the relationship between British and Portuguese investigators, leading to further difficulties.