School friends of Harry Potter star Rupert Grint have been banned from asking for his autograph.

Rupert, 17, who plays Ron Weasley, was besieged by other pupils at Richard Hale School in Hertford, says The Sun.

Schoolchildren now risk detention just for asking for his autograph.

The Sun's source said: "All the other kids were really proud of him and were asking him about the movies.

"Senior staff held an assembly warning pupils not to bother Rupert. Anybody flaunting the rules gets a lesson long detention."

Source: Press Release