A new search operation in the missing person case Maddie McCann attracted attention this week. A forensic expert explains what led to the new search.

An expert from the University of Kent names three theories about the background to the search operation. The search operation is based on "recent developments," according to a spokesman for the Braunschweig public prosecutor's office. The collected material will be handed over to the German authorities, but did not give details of the finds or the specific goal of the action.