The Mirror came up with a different unsubstantiated story in October 2007;
Is Madeleine McCann in reservoir?Police will search an isolated reservoir where they believe Madeleine McCann's body could have been disposed of.
On the topic of the thread they said;
Friends of the McCanns blasted reports that police had found a "bloody footprint" in their holiday apartment which apparently matched another on the bumper of their hire car.
The partial print, believed to match Kate's shoe size, was apparently on floor tiles outside the bedroom and allegedly contained blood which tests showed was a "moderate" match to Madeleine's.
Reports said the same shoe was rested on the car bumper in a manner "consistent with someone lifting a body in or out of the boot".
But a source at the Forensic Science Service in Birmingham, which is helping Portuguese police, said they had not even tested the bumper of the car - which is in Portugal - "so they have not had anything to match with any other prints".
https://www.mirror.co.uk/news/uk-news/is-madeleine-mccann-in-reservoir-513599