Santa Rosa officials say more arrests could be coming. Santa Rosa authorities say they're cracking down on arson, arresting five people for starting small fires and more arrests could be coming. Santa Rosa firesWhat we know:Officials in Santa Rosa believe more than half of the string of 30 fires in the last four weeks were set intentionally. That has clearly changed not only how we respond to fires, but also how our community responds to fires," Lowenthal said. The Source Santa Rosa Fire Department Division Chief Paul Lowenthal, Santa Rosa Police Dept.