AceShowbiz - Security has been stepped up around Michael Jackson's tomb in California after vandals defaced the star's resting place with permanent ink tributes. The King of Pop was interred at the Forest Lawn Cemetery memorial in Glendale, California following his death last year.

Fans have flocked to pay their respects since then - but some mourners have taken to writing tributes, including 'Miss you sweet angel' and 'Keep the dream alive'. Officials at Forest Lawn are fuming about the markings, because many were made using permanent ink.

A rep for the site tells TMZ.com, "Activity such as this is a prime example why we are evaluating the level of access to the various entrances of the Great Mausoleum." It isn't the first time overeager fans have caused a headache at the star-studded cemetery - in May, security was increased when the tomb of late Hollywood legend Clark Gable was found covered in lipstick marks.