The investigation into the disappearance of the missing British girl Madeleine McCann appears to have changed focus, her parents said in interviews broadcast Friday.

The McCanns told British television outlets they still believe their daughter is alive, but that Portuguese authorities seem to be exploring a different scenario.

"There's definitely been a shift. They haven't said that she's dead — on multiple occasions they (said they) believed they were looking for a missing child — but there's been a shift," Madeleine's father, Gerry, said in one interview.

Recent media reports have said that previously undiscovered traces of blood have been found in the hotel room in Praia da Luz, Portugal, from which the four-year-old girl disappeared as her parents ate in the hotel's restaurant.

Police in Britain are reportedly are still testing the substance to determine if it is blood, but the find has already prompted speculation that the child was murdered in the room — possibly by someone close to her.

Gerry McCann said he knew of no evidence to suggest his daughter was dead.

"I want to see the evidence which has caused their shift because it's so important to us as parents that if there is evidence, we need to know about it," he said.

Saturday will mark the 100th day since the four-year-old girl vanished from her parents' hotel room. The McCanns have mounted a dogged campaign to keep their daughter's name in the news in the run-up to the anniversary, but they have also been the target of hostile headlines.

Madeleine's mother, Kate, said the couple was undeterred by the attacks.

"We've been through that much pain by not having Madeleine with us that anything that's written or said is just a minor hurdle in comparison and we'll ride through it," Kate told Sky News.

The McCanns are also helping promote a new section of the video sharing Web site YouTube, launched Friday, intended to help find missing children.

The 'Don't You Forget About Me' channel hosts videos of missing children and is managed by the International Center for Missing and Exploited Children in Washington, D.C.