About 400 homes in northern Ohio were evacuated Wednesday after a railcar, possibly damaged in a derailment, leaked flammable liquid in a rail yard. No injuries were reported. Local authorities and crews from CSX Corporation were trying to determine how much of the liquid spilled in Willard, about 100 kilometers southwest of Cleveland. Four cars derailed at the rail yard late Tuesday while switching trains, and officials believe that is when one car was damaged, though the theory has not yet been confirmed, said a spokesman for the freight railroad. The spokesman said the nearly full tanker that leaked was carrying about 100,000 liters of styrene monomer, which is used to make various plastic and rubber products.