Police in Portugal hunting for missing British girl Madeleine McCann are checking several CCTV images.
Madeleine has been missing for a week
Chief Inspector Olegario de Sousa held a news conference to give more details of the search for the three-year-old.
He said the ground search was being scaled back as the results had been "zero", and no arrests had been made.
Items of clothing found locally did not belong to Madeleine, he said. A picture of the pyjamas she was wearing when she vanished has been released.
Madeleine, of Rothley, Leicestershire, disappeared from an apartment in Praia da Luz, in the Algarve, a week ago.
Police with dogs searched the McCann's apartment again on Thursday evening, while the family chose to remain at a police station outside the Algarve town.
Police said it is the final time they will search the block to look for clues. The wider search in the area will end in the next few days.
Mr Sousa said Madeleine's parents, Kate and Gerry McCann, and several of their British friends had been interviewed again on Thursday, but there were "no suspicions on them".
On scaling back the ground search, he said police and volunteers had searched a 200sq-km (77sq-mile) area - and some locations more than once.
Madeleine was wearing pink Eeyore pyjamas when she disappeared
Mr Sousa insisted he was doing everything he could to find the little girl, but so far from the ground search "the results are zero".
Local media have been reporting that police had examined footage taken at a petrol station, thought to be of two men and a woman driving a car with a British number plate, on the night of the Madeleine's disappearance.
And in the UK, Crimestoppers said it had passed on 35 "useful pieces of information" to Leicester police, who lead the UK side of the inquiry.
Police refused to confirm or deny reports about any possible leads, citing Portuguese law which prohibits them from releasing any information about an ongoing investigation.
But Mr Sousa did say "images of video surveillance" had been collected from several locations "in order to check possible leads that may have been recorded".
Investigators had asked locals if they recognised an image of a possible suspect, described by one shopkeeper as being very sketchy and looking only like "an egg with hair".
Madeleine's mother has attended a church service for her daughter in Praia da Luz.
Another service was held later on Merseyside, organised by friends of the family and led by Father Paul Seddon, who married the McCanns and baptised Madeleine.
On Friday, a vigil is planned in Glasgow, where Madeleine's father comes from.
And Celtic and Aberdeen footballers will show their support for the McCann family by wearing yellow armbands during their match on Saturday.
Earlier, photographs of Madeleine wearing an Everton FC shirt were released by the club.
Team captain Phil Neville said: "Everton has fans all over the world and I know that they, along with everyone connected with the football club, are hoping and praying for Madeleine's safe return."
Madeleine's grandmother, Susan Healy, from Liverpool, said Portuguese police made mistakes at the start of their investigation, possibly because they were "inexperienced".
However, the British ambassador to Portugal, John Buck, said he had been assured by Portuguese authorities that "everything possible" was being done.
Police have taken CCTV footage from this petrol station close to Praia da Luz
Meanwhile, Madeleine's uncle, John McCann, from Glasgow, countered criticism from those who say the couple were wrong to leave their children alone in their apartment while they ate dinner at a nearby restaurant.
"If you look at the layout of that place, it was entirely safe. The issue at stake here was, that the flat was broken into, and wee Madeleine was abducted," he told BBC Radio Five Live.
British child abduction experts have flown to Portugal to assist the investigation.
Superintendent Graham Hill of Surrey police, who investigated the disappearance and murder of Surrey schoolgirl, Milly Dowler, is among them.
The UK's Child Exploitation and Online Protection Centre (CEOP), which works to tackle child sex abuse, has launched a poster campaign appealing for information on Madeleine's disappearance.
It is asking people to display the posters, which can be downloaded from its website at www.ceop.gov.uk.
The international number for Crimestoppers is +44 1883 731 336. People with information about Madeleine can call anonymously.
The complex where Madeleine disappeared