Authorities are investigating a known British pedophile as a possible suspect in the disappearance of Madeleine McCann, The London Daily Mail reported Sunday.

The suspect is one of 52 British pedophiles with links to the Portuguese resort where the McCann family was vacationing when 4-year-old Madeleine disappeared from her hotel room while her parents were dining at a nearby restaurant, the Mail reported.

The suspect, whose identity has not been revealed, is the only person on the list of pedophiles who has not been cleared in the case.

Click here to read the full report in the London Daily Mail.

The Child Exploitation and Online Protection Center provided Portugese detectives with the 52-name list immediately following Madeleine's disappearance, the Mail reported.

Pedophilia remains a likely motive in the abduction because no ransom was ever demanded in the case, according to the report.