The Bureau of Land Management (BLM) Utah is seeking the culprits behind two incidents of vandalism that left protected petroglyphs near Moab riddled with crude carvings, including that signature and another, less distinct marking.

The vandals reportedly struck one site along Highway 279, a scenic stretch parallel to the Colorado River, and one by Hell’s Revenge, a well-known off-road slickrock trail. Photos taken by the Bureau, and first published by SF Gate, show clear damage to the petroglyphs that decorate the rock fave: In one photo, an investigator is seen measuring huge letters—spelling “Craig W”—that now cover a portion of petroglyph depicting animals.