PLYMOUTH, Mass. (AP) — The iconic Plymouth Rock and other sites were covered in red graffiti Monday during a vandalism spree discovered at the site marking the landing of the Pilgrims in Massachusetts 400 years ago.

Officials in Plymouth discovered the vandalism early in the morning. Workers had removed the red spray paint, which included the letters MOF and the numbers 508, from the rock before noon.

Authorities say no arrests have been made and the site was open to tourists.

The rock has come to symbolize the spot where William Bradford and the Mayflower Pilgrims disembarked before founding...