1 of 12 Author JK Rowling appeared at Edinburgh Castle on Friday to mark the launch of Harry Potter and the Half-Blood Prince, the sixth book in the hugely popular series.
2 of 12 Rowling greeted fans who had won a competition to meet her, before reading an extract from the book which had been eagerly awaited by readers around the world.
3 of 12 Josh Read, 10, arrived at Edinburgh Castle in full uniform of fictional magic school Hogwarts for the occasion.
4 of 12 American youngsters Sam and Jackson Payne were among the fans who waited patiently outside book stores in London for its midnight publication.
5 of 12 A Potter fan grabs his copy of the book in New Delhi, India, while another wears trademark Potter spectacles and wizard outfit.
6 of 12 Conor Duff-Lennon, aged nine, from Wicklow, was first to pick up a copy of the new book at Dubray Books in Dublin.
7 of 12 In central London, book retailer Waterstone's was among the stores holding special events for the midnight launch, with actors dressed as characters from the stories.
8 of 12 English language versions of the book went on sale in Ho Chi Minh City. The first five Harry Potter books were translated into 62 languages.
9 of 12 The book began selling rapidly at the Tsomet Safarim bookshop in Gaash in central Israel.
10 of 12 Brothers Kieran, aged eight, and Gerard Church, aged 10 (right) came from their home in Epping, Essex, to a midnight launch in central London.
11 of 12 Ahead of the launch fans queued at stores around the world wanting to be among the first to get their hands on a copy of the Half-Blood Prince.
12 of 12 The midnight sale took its toll on some Potter fans, despite best attempts to finish the 605-page book in one sitting. Ten million copies of Harry Potter and the Half-Blood Prince were expected to be sold worldwide on Saturday.