Police dogs will search the cars belonging to two 'special persons of interest' who are being questioned this week in Portugal.
Four suspects questioned in Madeleine McCann case
But despite the new developments, a source close to the investigation claims that authorities are no closer to the truth than they were when Madeleine went missing seven years ago.
The four men under investigation are being asked about their movements, text messages and phone calls on the night Madeleine disappeared in Praia de Luz back in 2007.
Madeleine McCann searching new site in Portugal
British police have been allowed to sit in on the questioning, and contribute their own questions to the inquiry. However, Scotland Yard's request for DNA samples from the four men have so far been blocked, as the order has yet to be signed off by a judge. They plan to use the samples to compare with hairs found in the McCann's holiday apartment in 2007 - evidence which could prove crucial to the investigation.
British police given permission to start digging at sites in Portugal
Scotland Yard have been keeping details of the ongoing investigation under wraps, only confirming that there will be several more phases after the initial search of scrubland concluded last month.