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Plymouth Rock is vandalized with red graffiti and other historic town monuments are covered in foul language ahead of the 400th anniversary celebration of the Mayflower arriving



Officials in Massachusetts discovered the vandalism early on Monday morning

Workers at the site removed red spray-painted graffiti sometime before noon

The graffiti included the letters 'MOF' and the number 508

Officials have yet to determine the motive for the graffiti

In years past, Plymouth Rock has been the site of political protests