Portuguese and German authorities have started a new search into the disappearance of Madeleine McCann in Portugal nearly two decades ago.
Madeleine was three years old when she vanished from an apartment complex in Praia da Luz in the Algarve during a family holiday on 3 May 2007. Her disappearance sparked a Europe-wide police investigation, and is one of the world's highest-profile unsolved missing person cases.
On Monday, Portuguese police confirmed they were carrying out the search on warrants issued by German prosecutors across 21 different plots of land.
Portuguese police say the search - which covers the municipality of Lagos near Praia da Luz - is due to continue until Friday.
Earlier on Tuesday, a Portuguese fire engine and four vehicles carrying German police arrived on the search site - which is around 3.5 miles from the resort where Madeleine was last seen.
Roads leading up to the site - which is sizable and mostly scrubland - have been closed off, while the day's focus appears to be on a nearby ruined building.
Around 30 German police officers are expected to participate in the search.
German investigators have taken the lead in the case since they identified Christian Brückner as their prime suspect in 2020.
The 48-year-old is currently serving a sentence in Germany for a separate crime - the rape of a 72-year-old American tourist in Portugal in 2005. He is due to be released later this year.
German authorities suspect him of murder but have not found enough evidence to bring charges, while Brückner repeatedly denies any involvement.
Portuguese authorities have also named Brückner as a formal suspect, or "arguido". They said they would hand over any evidence seized in the latest search to German authorities.
German police have a European warrant, which has been approved by their Portuguese prosecutors to allow them to go and conduct searches on private land.
The team of German and Portuguese investigators have been given permission to search 21 plots of land between the Ocean Club resort Madeleine disappeared from and where Brückner had been staying at the time.
German authorities told the BBC on Monday that "criminal proceedings are currently under way in Portugal" with the support of Portuguese police.
The previous search was two years ago, focused around a reservoir where Madeleine was last seen.
Brückner, who spent time in the area between 2000 and 2017, was found to have photographs and videos of himself near the reservoir.
The night Madeleine disappeared, her parents had been at dinner with friends at a restaurant a short walk away while Madeleine and her younger twin siblings were asleep in the ground-floor apartment.
Her mother, Kate, discovered she was missing at around 22:00.
A German documentary in 2022 found evidence that Brückner occasionally worked at the Ocean Club as a handyman, while German prosecutors have also linked his mobile phone data and a car sale to their case against him.
Madeleine's parents last month marked the 18th year anniversary of her disappearance, saying their "determination to leave no stone unturned is unwavering".
The Metropolitan Police - which this week said it was "aware of the searches being carried by the BKA (German federal police) in Portugal" - continues its investigation into Madeleine's disappearance.
The case, known as Operation Grange, has been going since 2011.