British detectives investigating the 2007 disappearance of Madeleine McCann have flown to Portugal to speak to authorities about questioning three potential suspects, British media reported on Wednesday.
The team from Scotland Yard travelled to the Algarve after British authorities wrote to Portuguese police to ask for help in tracing three burglars spotted in the area where the British three-year-old vanished.
According to the Daily Mirror newspaper, police were preparing to make the first arrests since British officers started to review the case in 2011.
Newspapers published photographs of Detective Chief Inspector Andy Redwood, who is leading the UK hunt, arriving in Faro holding two bulging box files.
A spokesman for the British police declined to confirm whether a team was in Portugal or the purpose behind the trip.
Madeleine went missing from her bedroom at the Praia da Luz holiday resort in the Algarve while her parents were dining with friends at a nearby restaurant, leading to a global search that gripped the world's media.
Police have since found mobile phone records which showed the three men in question made numerous calls to each other in the hours after the youngster disappeared, the Mirror said.
Despite huge international interest and numerous reported sightings from around the world and investigations stretching as far away as Australia, the girl's fate remains a mystery.
Her parents were named as official suspects by Portuguese police four months after her disappearance but in 2008 they were cleared and Portugal's public prosecutor later dropped the case, citing a lack of evidence.
London police launched a review of the case in 2011 and began their own investigation in July last year.