14/08/2014 16:53 BST | Updated 22/05/2015 10:12 BST

Madeleine McCann: Did Conspiracy Theorists Plot To Kidnap Twin Siblings?

Gerry (L) and Kate (C) McCann hold signs portraiting their missing daughter Madeleine reading 'don't give me up' as they leave the Tribunal Civil de Lisboa in Lisbon on February 10, 2010, after the last court session of their libel action against Goncalo Amaral the Portuguese police officer who led the initial probe in the case. Kate and Gerry McCann are suing Amaral for 1.2 million euros (1.7 million dollars) for defamation over allegations he made in a book that their daughter was dead and that they were involved in her disappearance. Madeleine went missing from a holiday apartment in the Algarve resort of Praia da Luz on May 3, 2007, a few days before her fourth birthday, as her parents and their friends dined at a nearby restaurant. AFP PHOTO/ FRANCISCO LEONG (Photo credit should read FRANCISCO LEONG/AFP/Getty Images)

Anti-McCann conspiracy theorists plotted to kidnap Kate and Gerry McCann's twins Sean and Amelie, a court has been told.

A close friend of the couple said users on website forums believed the twins might be able to shed some light on the disappearance of their big sister