Madeleine McCann's parents have said their belief that their missing daughter could still be alive has been reinforced by the fact that police did not find any evidence relating to her during their digs.
Kate and Gerry McCann they are “very pleased” with the search carried out at three sites in Praia da Luz, close to where Madeleine went missing in May 2007.
Locals in the area however have claimed the scrubland search is harming the small resort, and called for police to "just go home".
Officers investigating her disappearance said they found no evidence relating to her after completing their search in Portugal, but confirmed “more activity had been agreed”.
In a statement released through spokesman Clarence Mitchell today, Mr and Mrs McCann said: "We are very pleased that significant activity has taken place in Praia da Luz over the last 10 days with police officers and support teams from the UK working closely with the Policia Judiciaria and the Guarda Nacional Republicana.
"We are further encouraged that despite the intensive searches, no trace of Madeleine has been found and this reinforces our belief that she could still be alive.
"As parents of a missing child, we have always wanted all reasonable lines of inquiry to be followed and it is gratifying to know that a substantial amount of work will take place over the coming months with the close co-operation of the British and Portuguese authorities.
"We would like to thank all those involved for their efforts and the members of the public who have come forward with information."
The Madeleine McCann case
The Madeleine McCann case
1/25 Madeleine McCann
One of the last photos of Madeleine before her disappearance
2/25 Madeleine McCann
Madeleine McCann was three when she was abducted during a family holiday in 2007
3/25 Top worn by a man that detectives investigate with connection to disappearance of Madeleine McCann
A computer generated image of the distinctive burgundy long sleeve top worn by a man that detectives investigating the disappearance of Madeleine McCann are looking for
4/25 Apartment in Portugal from where Madeleine went missing
An aerial view of the Ocean Club apartments and pool where Madeleine McCann went missing
Jeff J Mitchell/Getty Images
5/25 Kate McCann
Kate McCann speaks to the press outside the court house in Lisbon on 12 September 2013 following the first audience of the McCann couple's libel proceedings against former inspector Goncalo Amaral for a book written about the case of their missing daughter
6/25 Kate and Gerry McCann
Kate McCann and Gerry McCann before the start of the 'Miles for Missing People' charity run in Regent's Park in London, 2011
7/25 Kate and Gerry McCann
Kate and Gerry McCann make an appeal at a press conference in the holiday resort of Praia da Luz, Portugal 7 May 2007
8/25 Kate and Gerry McCann
The McCann's give an interview with a Spanish television channel at their home in Rothley
9/25 Kate and Gerry McCann
Madeleine McCann was abducted in Portugal in May 2007
10/25 Kate and Gerry McCann
Preliminary forensic analysis on samples recovered from the McCanns' hire car raised the possibility of a match with Madeleine's DNA profile, according to the leaked report
11/25 Kate and Gerry McCann
Pope Benedict XVI blesses a photo of four-year-old abducted British girl Madeleine McCann, while meeting her parents Gerry and Kate McCann, after his weekly general audience at the Vatican, 2007
12/25 Kate and Gerry McCann
Gerald McCann and Kate McCann speak to the press on 4 May 2007 at the Ocean club appartement hotel in Praia de Luz in Lagos after Madeline vanished while her parents were out to dinner
13/25 Portuguese police search for Madeleine
Dozens of Portuguese police aided by dogs search for missing three-year old British girl Madelaine McCann in front of the Ocean club appartment hotel in Praia de Luz in Lagos
14/25 Kate and Gerry McCann
Gerald McCann and Kate McCann walk holding their two other children outside the Ocean club apartment hotel in Praia de Luz in May 2007
15/25 Madeleine McCann
Madeleine McCann pictured at the age of three, left, and as she might have looked aged nine
16/25 Kate and Gerry McCann
The parents of missing Madeleine McCann have described as "pure speculation" reports in the Portuguese press suggesting that a chief suspect in the disappearance of their daughter was killed in a tractor accident four years ago.
17/25 Tribute for missing Madeleine in Rothley, Leicesteshire
Three year old Cally prepares to add a yellow ribbon to a floral tribute for missing Madeleine McCann in Rothley in Leicesteshire, 2007
18/25 Support for the missing Madeleine
Everton captain Lee Carsley (L) leads his team onto the field, followed Mikel Arteta (C) and Manuel Fernandes (R) wearing Tshirts bearing a message of support for the missing British toddler Madeleine McCann, prior to the English Premiership match between Chelsea and Everton, at Stamford Bridge in London, 2007
19/25 Madeleine McCann
A poster appealing for information about Madeleine McCann at a Spanish railway station
20/25 BBC's Crimewatch reconstruction of Madeleine McCann's disappearance
Former porn star Mark Sloan (L) was cast in the BBC's Crimewatch reconstruction of Madeleine McCann's disappearance
21/25 Clarence Mitchell holds two artist's impression of the new suspect
McCann family spokesman Clarence Mitchell holds two artist's impression of the new suspect on 20 January 2008 in London. The description has come from British woman Gail Cooper, who was staying with her family close to the McCann's apartment in Portugal
22/25 Image of a woman sought in the case
Clarence Mitchell, the press spokesman for the McCann family, releases a photofit image of a woman sought in the search for missing Madeleine McCann
23/25 Suspect in disappearance of Madeleine McCann
Police released two e-fits of suspect in disappearance of Madeleine McCann
24/25 Raymond Hewlett
Convicted paedophile Raymond Hewlett, who is being sought in connection with the disappearance of Madeleine McCann
25/25 A picture of a suspect
An artist's impression of a suspicious man seen by a witness apparently watching the McCann family's apartment in Praia da Luz, Portugal, the day before Madeleine McCann went missing
Waiter Fernando Pereira said the timing of the searches, at the start of the tourist season was a "bloody nuisance" and claimed any further digging is “going to disturb everyone”.
"Everyone's opinion here - and even the British people who live here - is that it's a bit too much now. The British police should just go home."
A local estate agent, who gave his name only as Pedro, said the police investigation was putting off potential buyers when he showed them around properties.
He said: "Suddenly they see a huge police operation and you have to explain. Some people take it very lightly and don't care but others, you can see that they feel very uncomfortable.
"What happened is nothing to do with the people of Praia da Luz but it will always be associated with Madeleine."
Scotland Yard last night said there is "still a substantial amount of work yet to be completed in the coming weeks and months" and the recent activity was only the "first phase of this major investigation which has been agreed with the Portuguese".
The Portuguese have also reopened their inquiry into Madeleine's disappearance but, while they are working with the UK force, have refused to establish an official joint investigation.