Gerry and Kate McCann leave the court in Lisbon June 16, 2014. Gerry and Kate McCann, the parents of missing British girl Madeleine McCann, appeared at a Lisbon court after they launched libel action against a Portuguese former police chief, who said in a book that Madeleine's parents covered up the death of their daughter. REUTERS/Rafael Marchante (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Gerry and Kate McCann speak with journalists at the court in Lisbon June 16, 2014. Gerry and Kate McCann, the parents of missing British girl Madeleine McCann, appeared at a Lisbon court after they launched libel action against a Portuguese former police chief, who said in a book that Madeleine's parents covered up the death of their daughter. REUTERS/Rafael Marchante (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Members of Scotland Yard clean an area during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 7, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Carlos Vidigal (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Members of Scotland Yard insert a camera inside a sewer during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 7, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Rafael Marchante(PORTUGAL - Tags: SOCIETY CRIME LAW) 

Members of Scotland Yard work at an area during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 7, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Rafael Marchante (PORTUGAL - Tags: SOCIETY CRIME LAW) 

A member of Scotland Yard works at an area during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 7, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Rafael Marchante(PORTUGAL - Tags: SOCIETY CRIME LAW) 

A view of the area where members of Scotland Yard are searching for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 8, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Carlos Vidigal (PORTUGAL - Tags: CRIME LAW) 

Members of the Portuguese police arrive to guard an area in Praia da Luz, near Lagos, June 2, 2014. Police investigating the 2007 disappearance of British girl Madeleine McCann on Monday have sealed off an area of scrubland in the Portuguese resort where the three-year-old went missing. McCann disappeared from her family's holiday apartment in Praia da Luz in May 2007 while her parents dined with friends at a nearby restaurant, prompting a global search and headlines worldwide. REUTERS/Carlos Vidigal (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Members of Scotland Yard work at an area during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 8, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Carlos Vidigal (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Members of Scotland Yard work at an area during the search for missing British girl Madeleine McCann in Praia da Luz, near Lagos, June 8, 2014. McCann was three when she disappeared from her room at the Praia da Luz holiday resort in the Algarve in May 2007 while her parents were dining with friends at a nearby restaurant, prompting a global hunt and worldwide headlines. REUTERS/Rafael Marchante (PORTUGAL - Tags: SOCIETY CRIME LAW) 

Kate and Gerry McCann pose with a computer generated image of how their missing daughter Madeleine might look now, during a news conference in London May 2, 2012. Madeleine McCann went missing from a holiday villa in southern Portugal five years ago as her parents dined with friends. REUTERS/Andrew Winning (BRITAIN - Tags: CRIME LAW SOCIETY) 

Tourists walk under the windows of an apartment where Madeleine McCann disappeared in 2007, at Ocean Club tourist resort in Praia da Luz, southern Portugal October 14, 2013. Police conducting a global search for Madeleine McCann, the British girl who disappeared in 2007, have come up with a new version of events surrounding her suspected abduction and want to question one unidentified man in particular. McCann, then aged three, went missing from her room at the Praia da Luz holiday resort in Portugal in May 2007 while her parents were dining with friends at a nearby restaurant, triggering a search that gripped the world's media. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: CRIME LAW TRAVEL) 

Kate McCann, whose daughter Madeleine went missing during a family holiday to Portugal in 2007, attends a news conference at the launch of her book in London May 12, 2011. REUTERS/Chris Helgren (BRITAIN - Tags: CRIME LAW) 

Kate McCann speaks with journalists after she leaves the court in Lisbon September 12, 2013. Kate McCann, the mother of missing British girl Madeleine McCann, appeared at the Lisbon court after she launched libel action against a Portuguese former police chief, who said in a book that Madeleine's parents covered up the death of their daughter. REUTERS/Rafael Marchante (PORTUGAL - Tags: CRIME LAW POLITICS) 

Kate and Gerry McCann hold hands as they speak about their missing daughter at a news conference in London May 2, 2012. Madeleine McCann went missing from a holiday villa in southern Portugal five years ago as her parents dined with friends. REUTERS/Andrew Winning (BRITAIN - Tags: CRIME LAW SOCIETY) 

People walks near a billboard of Madeleine McCann at Praia da Luz tourist resort, April 5, 2009, where Madeleine went missing. Gerry McCann, father of Madeleine, is at the resort to film a documentary re-enacting the May 3, 2007 disappearance of his daughter Madeleine, according to the family's press officer Clarence Mitchell. REUTERS/Hugo Correia (PORTUGAL CONFLICT SOCIETY) 

Portugal's former top investigator Goncalo Amaral pose with his book entitled "Maddie:The Truth about the Lie" about the disappearance of British girl Madeleine McCann during the presentation in Lisbon July 24, 2008. REUTERS/Hugo Correia (PORTUGAL) 

Robert Murat (C) prepares to make a statement with Michaela Walczuch (L) and lawyer Louis Charalambous (R) outside the High Court in central London July 17, 2008. Murat, who was named as an official suspect in the disappearance of British girl Madeleine McCann in Portugal, has accepted a settlement with a number of UK newspapers, local media reported. REUTERS/Toby Melville (BRITAIN) 

Clarence Mitchell, the spokesman of Kate and Gerry McCann, the parents of missing British girl Madeleine McCann, shows a sketch of a man believed to have abducted Madeleine from the family's apartment in Praia da Luz in Portugal, during a news conference in London January 20, 2008. REUTERS/Alessia Pierdomenico (BRITAIN) 

A man looks at posters offering rewards for finding missing British girl Madeleine McCann, in Praia da Luz, southern Portugal, May 2, 2008. McCann's parents said on Thursday they believe their daughter is still alive, a year after she disappeared while on holiday in Portugal. REUTERS/Hugo Correia (PORTUGAL) 

Kate McCann, the mother of missing British girl Madeleine McCann, leaves home twins with Sean (L) and Amelie, in Rothley, central England September 12, 2007. Portugal's public prosecutor on Tuesday passed the case against the parents of missing 4-year-old Madeleine McCann to a criminal judge who will decide whether there are grounds for a trial. REUTERS/Rui Vieira/Pool (BRITAIN) 

Gerry (L) and Kate McCann, parents of Madeleine McCann, walk near the Portuguese beach resort of Lagos with their children, Amelie and Sean, May 31, 2007. Pope Benedict on Wednesday comforted the parents of the four-year-old British girl snatched from a Portuguese holiday resort and blessed a photograph of the child held up by her mother. REUTERS/Nacho Doce (PORTUGAL) 

Kate and Gerry McCann, parents of missing British girl Madeleine McCann, hold a poster during a news conference in Berlin June 6, 2007. Gerry and his wife Kate are visiting Germany to meet politicians later on Wednesday. The poster reads 'Look into my eyes - Madeleine McCann was abducted in Praia da Luz, Portugal on May 3, 2007'. REUTERS/Alex Grimm (GERMANY) 

Kate and Gerry McCann, parents of missing British girl Madeleine McCann, hold up similar sleep wear which their daughter was wearing on the night of her abduction, during a news conference in Berlin June 6, 2007. Gerry and his wife Kate are visiting Germany to meet politicians later on Wednesday. REUTERS/Alex Grimm (GERMANY) 

A poster of missing four-year-old Madeleine McCann is seen on a Police Republican Guard near Lagos June 2, 2007. REUTERS/Nacho Doce (PORTUGAL) 

Pope Benedict XVI blesses a photo of four-year-old abducted British girl Madeleine 'Maddy' McCann, while meeting her parents Gerry (R) and Kate McCann (2nd R), after his weekly general audience at the Vatican May 30, 2007. The parents of a four-year-old British girl snatched from a Portuguese holiday resort nearly a month ago met Pope Benedict on Wednesday and the Pontiff blessed a photograph of the child. The mother of Madeleine McCann appeared to be holding back tears as she held up the picture of her daughter, which the Pope touched gently and then blessed with the sign of the cross. REUTERS/Osservatore Romano (VATICAN) 

Gerry MacCann, father of the missing British girl Madelaine McCann, looks at messages of support near their home in Rothley, central England, May 21, 2007. REUTERS/Darren Staples (UK) 

Gerry (L) and Kate McCann, parents of the missing three-year-old British girl Madeleine McCann, make a statement to the media in the Portuguese beach resort of Lagos May 11, 2007. Portuguese police are winding down their search for the kidnapped Madeleine McCann, indicating they believe she has been spirited out of the resort region where she was taken, police said on Thursday. Police have searched the countryside and more than 500 apartments in and around the Praia da Luz resort in the southern Algarve region since McCann went missing a week ago. REUTERS/Hugo Correia (PORTUGAL) 

Pyjamas similar to those thought to be worn by Madelaine McCann at the time she was kidnapped are displayed by Portuguese police in Portimao May 10, 2007. Portuguese police took the parents of the kidnapped British three-year-old girl to a police station on Thursday to seek more details on her disappearance from a holiday resort bedroom last week, police said. REUTERS/Vasco Celio (PORTUGAL) 

Portuguese forest rangers search for missing three-year-old Madeleine McCann in a forest near a Portuguese beach resort in the southern province of Algarve May 8, 2007. Police are investigating whether a paedophile ring ordered the kidnap of the three-year-old British girl who vanished from her bed five days ago in southern Portugal, daily Correio da Manha reported on Tuesday. McCann is believed to have been abducted from her apartment on May 3 in Praia da Luz, a popular resort in the Algarve, just yards away from where her parents were dining. REUTERS/Melanie Maps (PORTUGAL) 

Portuguese policemen work at a Portuguese beach resort in the southern province of Algarve May 5, 2007. A British girl who disappeared from her bed in the Portuguese beach resort while her parents dined nearby was kidnapped, police said on Saturday. Police believe three-year-old Madeleine McCann is still alive and have a drawing of a suspect based on evidence from witnesses, said Guilhermino Encarnacao, head of the judicial police in the Faro area of the Algarve. REUTERS/Vasco Celio (PORTUGAL) 

Gerald McCann (L) and Kate MacCann, parents of Madeline McCann, talk to the journalists in the southern province of Algarve May 4, 2007. A three-year-old British girl may have been kidnapped from her bed in a Portuguese beach resort while her parents dined nearby, family friends and a police source said on Friday. REUTERS/Melanie Maps (PORTUGAL)