No end to Madeleine family agony
The parents of Madeleine McCann are spending a second weekend without their daughter, who disappeared from a Portuguese holiday apartment on 3 May.
Prayers will be said for Madeleine at a church service in the Algarve village of Praia da Luz later.
On Saturday, Gerry McCann paid an emotional tribute to his daughter as the family marked her fourth birthday.
No suspects in the abduction case have been named, but witnesses may being making formal statements on Monday.
Rewards totalling £2.5m have been offered to anyone who can help with information leading to the safe return of Madeleine, from Rothley in Leicestershire.
Businessman Sir Richard Branson, footballer Wayne Rooney and children's author JK Rowling are among those who have contributed.
Map of resort
REWARD CONTRIBUTORS
JK Rowling
Sir Philip Green
Richard Branson
Bill Kenwright
Eggert Magnusson
John Madejski
Jacqueline Gold
Simon Cowell
Wayne Rooney
Michael Vaughan
Sir Tom Hunter
Sir Stelio Haji-Ioannou
John Hargreaves
Speaking at a special mass on Saturday, Kate and Gerry McCann called for people to keep looking and praying for their daughter, but also acknowledged the huge effort and resources being put into the search.
"Today we should be celebrating the fourth birthday of our daughter Madeleine," said Mr McCann.
"Instead we have had to remember what a normal, beautiful, vivacious, funny, courageous and loving little girl we are missing today."
Madeleine's uncle, John McCann, praised the amount of support the family has received from people in the UK.
He told the BBC on Sunday: "The general response has been magnificent - the wishes and the prayers that are coming in from all over the country has been astounding."
The official ground search for Madeleine in the Algarve has ended, but police say they still have significant leads to follow up.
The focus has shifted from a local search for Madeleine to an international child abduction inquiry, amid suggestions she may have been taken out of Portugal.
Some of the nine people who were questioned on Thursday and Friday - mainly family and friends of the McCanns - may be asked to make formal court statements, BBC correspondent Alison Roberts said.
Police have said none of the people in the McCanns' close circle is a suspect.
Detectives are also continuing to cross-check CCTV footage of several cars with witness statements in their efforts to identify a possible abductor, our correspondent said.
Police have declined to confirm or deny reports about any possible leads, citing Portuguese law.
The international number for Crime stoppers is +44 1883 731 336. People with information about Madeleine can call anonymously.
