An English test due to be taken by year six pupils across the country today has been accidentally published online, the second such incident in recent weeks.
The answers to the Key Stage Two grammar, punctuation and spelling test are understood to have appeared on a website for an English exam board on Monday evening, where they remained in a password-protected area for several hours before being removed.
The leak was not judged to be significant enough to cancel Tuesday's test, but Labour said the gaffe was a "body blow" to parent and teacher confidence in the Department for Education (DfE).
A spokesman said Education Secretary Nicky Morgan had been notified of the breach.
In April a spelling test due to be taken by thousands of seven-year-olds was scrapped after it was accidentally released online.
The section of the Key Stage One final exam was published as a sample paper on the DfE website on January 26, which a spokesman described as "deeply regrettable".