A recent spike of gang-related graffiti this past month, has caused thousands of dollars in damages in the city of Hollister . City officials say the graffiti has been aimed at city buildings mostly covering Dunne Park, Park Hill, the Hollister Community Center and Hollister City Hall. So far, clean-up efforts have cost the city up to 15-hundred dollars per day. Officials say the work to eradicate the graffiti takes workers away from other maintenance work around city streets.