EAST PALESTINE, Ohio (AP) — A freight train derailment in Ohio near the Pennsylvania state line left a mangled and charred mass of boxcars and flames Saturday as authorities launched a federal investigation and monitored air quality from the various hazardous chemicals in the train.

About 50 cars derailed in East Palestine at about 9 p.m. EST Friday as a train was carrying a variety of products from Madison, Illinois, to Conway, Pennsylvania, rail operator Norfolk Southern said Saturday. There was no immediate information about what caused the derailment. No injuries or damage to structures we...