A series of children's books has been pulled from school library shelves after a web address printed in the back was found to link to explicit content.
The Spy Dog, Spy Pups and Spy Cat books by Derby author Andrew Cope are aimed at children of primary school age.
Until recently a URL inside the books directed keen readers to a companion website featuring bonus content but the address has since been taken over by a third party which has posted inappropriate material.
Publisher Puffin said it was taking the matter extremely seriously and was working to get the website removed.
