Authorities in Ohio say there is no indication of any risk to public health from the derailment of a Norfolk Southern cargo train between Dayton and Columbus, the second derailment of a company train in the state in a month. Clark County officials say about 20 of the southbound train’s 212 cars, including four tankers, derailed at about 4:45 p.m. Saturday in Springfield Township near a business park and the county fairgrounds. Residents living within 1,000 feet were asked to shelter in place as a precaution, but officials early Sunday said there was “no indication of any injuries or risk to public health at this time.”