British celebrities and business leaders have put up a 2.97 million-U.S.-dollar reward to help find Madeleine McCann, a 4-year-old who disappeared from a Portuguese holiday resort 10 days ago, media reports said Monday.

A British tabloid said J.K. Rowling had offered the single largest contribution to the reward fund started by it. Calling Rowling's pledge "staggering," the paper said she asked the amount be kept secret.

J.K. Rowling, 41, is one of Britain's richest people, with an estimated fortune of 1.2 billion dollars, thanks to the best-selling novels and films about her boy wizard, Harry Potter.

The newspaper said its editor will decide who receives the reward after consulting with the Portuguese authorities.

Tycoon Sir Richard Branson offered 240,000 dollars and American Idol judge Simon Cowell promised to give 120,000 dollars.

Manchester United striker Wayne Rooney, together with his fiancee Coleen McLoughlin, offered 60,000 dollars.

Sunday services in Britain and Portugal saw worshippers remember the girl and her family amid emotional scenes. Some half a million pilgrims gathering in Fatima, north of Lisbon, many of them carrying pictures of the youngster, also prayed for her.

At a church service on Saturday, Madeleine's father said her disappearance had unleashed a "tidal wave" of devastation on the family.

"Today we should be celebrating the fourth birthday of our daughter Madeleine," he said. "Instead we have had to remember what a normal, beautiful, vivacious, funny, courageous and loving little girl that we are missing today."

Editor: Donald