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It is more than 13 years since three-year-old Madeleine McCann vanished from the Portuguese coastal village of Praia da Luz while on holiday with her parents, Kate and Gerry, and siblings.
As the Metropolitan Police have identified a suspect, here is a timeline of events surrounding her disappearance and some of the developments over the following years.
2007
May 3rd: Kate and Gerry McCann, from Rothley, Leicestershire, leave their three children asleep in their holiday apartment in Praia da Luz in southern Portugal while they dine with friends at a nearby tapas restaurant.
Nothing is amiss when Mr McCann checks on the youngsters just after 9pm, but when his wife goes back at about 10pm she finds three-year-old Madeleine missing.
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Jane Tanner, one of the friends dining with the McCanns, reports seeing a man carrying a child earlier that night.
May 14th: Detectives take Anglo-Portuguese property developer Robert Murat in for questioning and make him an “arguido”, or formal suspect.
Officers also search the home he shares with his mother in Praia da Luz, just 100 yards from where the youngster vanished.
August 11th: Exactly 100 days after Madeleine disappeared, investigating officers publicly acknowledge for the first time that she could be dead.
September 7th: During questioning of Mr and Mrs McCann, detectives make them both “arguidos” in their daughter’s disappearance.
September 9th: The McCanns fly back to England with their two-year-old twins Sean and Amelie.
2008
July 21st: The Portuguese authorities shelve their investigation and lift the “arguido” status of the McCanns and Robert Murat.
2011
May 12th: Mrs McCann publishes a book about her daughter’s disappearance, on Madeleine’s eighth birthday.
Scotland Yard launches a review of the case after a request from Home Secretary Theresa May, supported by Prime Minister David Cameron.
2012
April 25th: Scotland Yard detectives say they believe Madeleine could still be alive, release an age-progression picture of how she might look as a nine-year-old, and call on the Portuguese authorities to reopen the case, but Portuguese police say they have found no new material.
2013
July 4th: Scotland Yard confirms it has launched its own investigation, Operation Grange, into Madeleine’s disappearance two years into a review of the case. It has “genuinely new” lines of inquiry and has identified 38 people of interest, including 12 Britons.
October 24th: Portuguese police confirm that a review of their original investigation has uncovered new lines of inquiry, and they reopen the case.
2014
January 29th: British detectives fly to Portugal amid claims they are planning to make arrests.
June 3rd: Sniffer dogs and specialist teams are used to search an area of scrubland close to where Madeleine went missing.
December 12th: Detectives began questioning 11 people who it was thought may have information on the case.
2015
September 16th: The Government discloses that the investigation into the disappearance of Madeleine has cost more than £10 million (€11.7 million).
October 28th: Scotland Yard’s investigation into the disappearance has been cut from 29 officers to four.
2017
April 30th: The couple prepare to mark 10 years since their daughter’s disappearance with a BBC interview where they vow to do “whatever it takes for as long as it takes” to find her.
2019
May 3rd: Local media report Portuguese detectives are investigating a foreign paedophile as a suspect in the abduction of Madeleine McCann.
2020
June 3rd: Police reveal that a 43-year-old German prisoner has been identified as a suspect in Madeleine’s disappearance. – PA