Harry Potter just keeps topping himself.

"We expected to sell 1 million copies in the first week, and we sold that many within the first 48 hours," Barnes & Noble Inc. CEO Steve Riggio said Sunday as "Harry Potter and the Order of the Phoenix" set records around the world in its first weekend.

Nobody in publishing had seen anything like it, at least since the last Potter book came out three years ago. Scholastic, the book's U.S. publisher, estimated 5 million copies were sold the first day alone, well ahead of the pace of "Goblet of Fire." Borders Group Inc. reported worldwide sales of 750,000 the first day. Amazon.com shipped out more than a million copies of the new book, making Saturday the largest distribution day of a single item in e-commerce history.

In London, the supermarket chain Tesco said it sold 317,400 copies of the fifth in J.K. Rowling's fantasy series in the first 24 hours, seven times the number sold in the first week of Potter IV, "Harry Potter and the Goblet of Fire."

"The book has now broken all our sales records and there is no doubt that this will be the best-selling book we have ever stocked," said Tesco book buyer Caroline Ridding.

Some retailers had worried that even an enormous first printing, 8.5 million in the U.S. alone, wouldn't last long enough to keep up with demand. A lot of latecomers found themselves settling for a mere pre-order in place of a book.

Riggio said many Barnes & Noble stores had run out of copies and that more would arrive "over the next few days." The Book House in Albany, N.Y., sold out its 1,050 copies by Saturday afternoon, even though it limited purchases to two per person.

A Borders bookstore in Columbus, Ohio, had just enough Potter books for the people who reserved them this weekend, and another shipment was expected by Monday or Tuesday.

Borders store manager Mathew Kowalski said many customers who could not get the new book bought copies of the other Potter novels.

"We sold some other books, but it was mainly Harry Potter sales this weekend," Kowalski said.

The release of Potter V was not flawless. Some stores put the book on sale before its June 21 publication date and a seller in Lynchburg, Va., Givens Books, discovered that more than 40 of its copies were missing 33 pages. Scholastic Inc., the U.S. publisher of Potter, said the books would be replaced.

Rowling's first four Potter books have sold an estimated 192 million copies worldwide and have been published in at least 55 languages and distributed in more than 200 countries. Blockbuster movies were made of the first two books and the movie stemming from the third will be released next year.

All the hype for Harry didn't stop critics from enjoying "Order of the Phoenix." The New York Times, in a rare front page review, praised the author's "bravura storytelling skills and tirelessly inventive imagination." USA Today cited Rowling's "wonderful, textured writing." The Associated Press said: "It was worth the wait. And then some."

Lights burned all through the weekend as Potter fans didn't let anything as silly as sleep keep them from working through the 896-page book.

Eleven-year-old Geronimo "G" Gisleson of New Orleans received his copy Saturday and was up to page 650 by midday Sunday.

When his mother, Susan, went into his room Sunday morning, she realized he had been reading all night, using the light from a bathroom across the hall that had been left on as a night light for his younger brother.

"He was sprawled on the floor with the book next to him," she said.