PARENTS have been warned not to let children use the website Wikipedia unsupervised after an entry on a popular children's book was edited to contain pornographic material.

Sexual and violent acts between characters were added last week to the online plot summary for Mrs Frisby And The Rats Of NIMH, which is recommended for students in years 5 to 9.

The edited page for the book, on the list for the Premier's Reading Challenge, was visible for about an hour before it was changed to the original text.