Police investigating the disappearance of Madeleine McCann are being "realistic rather than optimistic" in their expectations, ITV News Correspondent Martin Geissler has said.
Specialist teams spent last week investigating an area of land a few minutes walk from the resort where Madeleine was staying with her family, and have cordoned off a new search area today.
Martin Geissler reports: "The big site we assume yielded nothing last week. There was a definite sense of disappointment among the British and Portuguese investigating teams and they've now moved on.
"We think the second site will be searched and possibly exhausted by the end of the day, they'll move onto site three tomorrow and if necessary they'll continue that investigation until Friday.
"I think they are realistic rather than optimistic in their expectations from now on. That begs the question - if they find nothing here then what next for the Madeleine McCann investigation?"
Police in Portugal investigating the disappearance of Madeleine McCann will start searching a new site in Praia da Luz.
Last week, officers ended their search of an area of scrubland near the Ocean Club complex where Madeleine went missing from in May 2007.
It is believed that Scotland Yard will hunt for clues at two fresh sites this week, which are both around half a mile from where Madeleine disappeared.
Forensic teams involved in the search for Madeleine McCann are expected to move to two other sites after investigators finished their search of an area of scrubland in Praia da Luz.
The operation has been halted for two days to coincide with a Portuguese national holiday and will restart on Wednesday.
Police investigating the disappearance of Madeleine McCann have finished their first search of an area of scrubland in Praia da Luz, Portugal.
Specialist teams used ground-penetrating radar equipment, examined drains and dug holes as they hunted for clues into what happened to Madeleine, who went missing when she was three-years-old from the nearby Ocean Club resort apartment in May 2007.
Cordons around the area of land in the Algarve holiday resort were removed last night.
The parents of Madeleine McCann have said they were feeling "encouraged" by this week's events, as British police carry out investigations on an area of scrubland close to where she went missing in Portugal.
Writing on their Official Find Madeleine Campaign Facebook page, the McCanns said: "We are kept updated on the on-going work in Portugal and are encouraged by the progress", the message said.
They added: "We would like to ask people to refrain from spreading rumours and speculation based on inaccurate press reporting".
Tourists and locals in the Praia Da Luz holiday resort in Portugal have described the negative impact of the latest search for Madeleine McCann, as police have applied to extend their examination of wasteland near where she vanished in 2007.
One hotelier said many of her guests had cancelled this week and called the case "catastrophic" for business.
Lucilia Matos, who has run the Aurora Sol guest house for the past 12 years, said only four of her 20 rooms were occupied, and three of those were taken up by journalists.
"I know other people with the same business I have and it's the same," she said. "It's a shame the investigations always start at the same time - always in May, June.
"It's a case that's very complicated, I know, we understand. But it's a little village and we need so much work for the summer. It's always the same. We are not happy."
Longtime tourist to the resort Eileen Berry, 65, said: "We are frequent visitors to Luz and you can sense the atmosphere here that things are not good."
Police investigating an area of scrubland close to where Madeleine McCann disappeared in 2007 have removed the tent that had protected one "location of interest" yesterday.
A pile of earth suggests substantial excavation there, while today's investigations are focused in another spot a few yards away.
There is no suggestion as to what, if anything, they may have found.
Police officers searching scrubland in Portugal in the hunt for Madeleine McCann have sent cameras into drain systems under the wasteland.
The Metropolitan Police's Detective Chief Inspector Andy Redwood, who is in charge of the hunt for Madeleine McCann, watches police continue to clear and search scrubland in Praia da Luz, Portugal, today.