Amazon has apparently deleted over 900 reviews of Hillary Clinton's book in the first 24 hours since it went on sale, after the publisher raised concern that the reviewers had not actually read the book.

Mrs Clinton's book, What Happened, went on sale on Tuesday. By Wednesday there were 1,600 reviews - many of which did not discuss the book, but instead offered high praise or scathing criticism of Mrs Clinton.

The website Quartz analysed the data from the reviews and found that of the book’s 1,600 or so reviews as of Wednesday morning, only 338 were from users with verified purchases of the book - that is, those who actually bought the item on Amazon.com. They could, of course, have bought the book somewhere else and then logged onto Amazon to post a review, but the majority of Amazon's reviews are from people who bought the book on their site.