The disappearance of Madeleine McCann remains unsolved after testing of crucial DNA evidence failed to produce a match, according to reports.

Maddie, then 3, disappeared from an apartment in the Portuguese holiday resort of Praia da Luz on May 3, 2007.

Madeleine had been left alone sleeping with her twin siblings in the ground-floor apartment while parents Kate and Gerry McCann ate nearby at a tapas restaurant with friends.

(Image: Steve Parsons/PA Wire)

Madeleine McCann plane footage unearthed

Part of the investigation was centred on DNA taken from the apartment.

It was hoped that new technology using DNA-17 techniques could have provided clues to the case.

The Mirror reports that DNA taken from the apartment where the tot disappeared failed to show a match.

(Image: PA)

But a source told The Sun: “As you would expect, all efforts have been made to obtain forensic evidence in Madeleine’s case.

“These efforts include DNA testing on forensic samples using updated techniques. So far nothing has materialised but work still continues.”

DNA-17 has been hailed as the biggest scenes of crime breakthrough in 20 years, with The Sun reporting that Met Police officers asked for items to be retested in Portuguese labs.

The search for the toddler is the most high profile missing persons case in history and included a £11.6 million Scotland Yard investigation to help find her.

The story of Madeleine's disappearance came under the spotlight once again when an eight-part documentary about the missing child was released on Netflix earlier this year.

The series featured appearances from various key figures and the investigators involved in the search for Madeleine.

Show more

A Met Police spokeswoman said: "The investigation into the disappearance of Madeleine McCann remains ongoing. We are not providing a running commentary."

A Met Police spokeswoman said: "The investigation into the disappearance of Madeleine McCann remains ongoing. We are not providing a running commentary."