They published a range of downloadable posters, luggage tags and car stickers on their official search website.
And they urged tourists to ake them on holiday with them this summer in the hope someone will sport the youngster who vanished in Portugal 12 years ago.
The campaign comes three weeks after Britain’s top police officer admitted she did not know if the case would ever be solved.
Metropolitan Police commissioner Cressida Dick said she could not say if her detectives would ever discover what happened to Madeleine despite an investigation which has cost UK taxpayers £12million.
A message posted on the Official Find Madeleine Campaign Facebook page – run by well-wishers on behalf of her doctor parents Kate and Gerry – said: “Are you going on holiday?
“Please consider taking our luggage tags and posters. You can download and print from home. If you do hang the poster please ask permission first.
“Thank you for not giving up on Madeleine #ForAsLongAsItTakes.’’
A message on the Find Madeleine website stressed the importance of putting up posters around world.
It said: “Fortunately there are many cases of abducted children being found and returned to their families – even after long periods of time.
“The posters are available in many different languages and we would be really grateful if you would take them with you when going on your holidays,’’ it went on.
“It really helps. If you are going on holiday, in addition to the new posters you could take one of our Madeleine car stickers to display in your (hire) car.
“If you would like some car stickers or some Madeleine luggage tags please contact our campaign email address and leave your details.
“If there is a tourist information office near to where you live maybe you could ask if they would display a Madeleine poster in their office or make posters available for foreign tourists to take back home with them.
“If you are going on a pilgrimage this year we would be grateful if you would take some Madeleine prayer cards with you for distribution.’’
The website boasts seven different posters all featuring different designs but similar photos.
One is a now-famous photo of Madeleine laughing in a floppy pink hat taken not long before the then-three-year-old vanished from her family’s holiday apartment in the Algarve resort of Praia da Luz in 2007 while her parents dined with pals in a nearby tapas bar.
Another is an age progression picture commissioned by the Met in 2012 and compiled by experts showing what she may look like aged nine.
- Madeleine McCann
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