cThe NPS encourages anyone who may have information on these crimes to submit an anonymous tip or call 207-288-8791. 

The graffiti, primarily consisting of red blazes spray painted on trees, rocks, and cairns, creates confusion for visitors, who should follow the blue blazes maintained by the NPS to mark established hiking trails. In addition to the red paint damaging park resources, it encourages visitors who might not be familiar with these trails to embark on potentially dangerous routes. 

Trails staff are working diligently to restore the damaged park resources, as park law enforcement rangers continue to investigate the incidents. 

Original source can be found here