Six years after Madeleine McCann went missing during a vacation with her parents, Scotland Yard has opened an investigation into the case, and announced they are looking into "38 persons of interest."

Scotland Yard has been reviewing the case for the last two years and made it public on Thursday that they'll now be stepping up their effort with a formal investigation.

Madeleine's parents, Gerry and Kate McCann, called it a "big step forward" and are confident their daughter will eventuall