Crews spent Monday cleaning up Plymouth Rock and other monuments that were vandalized with graffiti over the weekend in Plymouth, Mass.

Photos on social media showed red spray paint covering the rock, which marks the area where William Bradford and the pilgrims of the Mayflower disembarked before establishing Plymouth Colony in 1620.

The letters “MOF” and the numbers 508 covered the rock and its inscription. Vandals defaced the Pilgrim Maiden statue and the National Monument to the Forefathers, as well as a bench that honors the daughters of the colonists who arrived in Plymouth on the ship Anne in 1623 and four colorful artworks in the shape of scallop shells, said Melissa G. Arrighi, the Plymouth town manager.

The floor of the Half Shell Band Stand was also damaged. The Plymouth Police Department is investigating the vandalism.