The graffiti appears to be inspired by Lewis Carroll's poem

Sometime between midnight on Monday and midnight on Tuesday, graffiti was sprayed on a boulder at the Vale Castle.

The vandalism was similar to the attacks on the Vale Church and the Millennium Stone and detectives are investigating whether this third act of stencilled graffiti, at the Vale Castle, is linked.

The message says "Don't step on the momeraths" (sic).

`Twas brillig, and the slithy toves Did gyre and gimble in the wabe: All mimsy were the borogoves, And the mome raths outgrabe Jabberwocky, Lewis Carroll

Trying to work out what the message means, leads only to the Lewis Carroll poem, Jabberwocky, from Through the Looking-Glass, which mentions mome raths.

Rob Roussel, a member of the Vale Earth Fair Collective who hold an annual music festival at the Castle said: "This is not the way to treat an historic monument.

"We take great care of the Castle even though we hold the Channel Island's biggest music event there."

In another attack this month, at Vale Church, the words "This used to be God's house - but he moved" were sprayed in black paint on the church door, one of the walls and a window.

The Millennium Stone at L'Ancresse was also targeted and sprayed with a graffiti message: "This is not a photo opportunity".