Four men, including two described as "people of interest," have been called in for questioning by Portuguese police in connection to the disappearance of British toddler Madeleine McCann, according to the BBC.
Interested in ?Add as an interest to stay up to date on the latest news, video, and analysis from ABC News.
Today's police interviews come more than 11 years after 3-year-old Madeleine disappeared from her parent's hotel room while on vacation at a Portuguese resort.
A spokesman for British investigators at Scotland Yard would not confirm the interrogation, but the BBC reported this morning that two men have been identified as "arguidos," or people of interest.
Those two individuals were brought in for questioning at the Policia Judiciaria in Fargo, Portugal, and have already been released.
Their names have not been released, but the BBC reported that they went to the station "of their own free will."
A third man allegedly has severe schizophrenia and has not been questioned, but is in police custody, BBC reported.
The status and whereabouts of the fourth person remains unknown.
Three of the four men are believed to be Portuguese citizens and the fourth individual is of Russian descent, according to the BBC. The "arguidos" and the two other men have not been publicly matched to their nationalities.
British police officers reportedly flew to Portugal for the interrogation and were in the room with the men this morning, but Portuguese police were responsible for asking questions, the BBC reported.
A spokesman for Scotland Yard would not confirm the interrogations or release any information about updates in the case, saying they are "not prepared to give a running commentary on this investigation."
The latest update to the ongoing investigation, known as "Operation Grange," that the British officials have confirmed publicly came last month when they spent eight days combing specific suspicious areas of land near the Priaia Da Luz resort where the McCanns were staying when their daughter disappeared.
They released a statement following the search saying that they found "no evidence relating to Madeleine McCann," but said that "it has given us an essential understanding of the activity on and people that have used this piece of land."