(Reuters) Nearly 2,000 residents of eastern Ohio remained under evacuation orders as railroad crews drained and burned off a toxic chemical from five tanker cars of a freight train that derailed in a fiery wreck three days earlier, officials said.
The venting of pressurized vinyl chloride, a highly flammable and carcinogenic gas, began with a single explosion, as was anticipated, followed by a steady incineration of the remaining cargo, said Sandy Mackey, a spokesperson for the Ohio Emergency Management Agency.
"That controlled release was the one explosion," she told Reuters by telephone. "It went as planned. It seemed to be a successful incident."
No injuries were reported, either from Monday's operation or the accident on Friday night, authorities said.
Live video on Monday showed a towering column of thick, black smoke rising from the accident site in East Palestine, Ohio, a town close to the Pennsylvania border northwest of Pittsburgh.
The train, operated by Norfolk Southern Railroad and consisting of three locomotives and 150 freight cars, was headed from Illinois to Pennsylvania when it derailed shortly before 9 p.m. EST on Friday, setting off a massive fire that forced the evacuation of hundreds of homes in the immediate vicinity.
About 50 cars actually left the tracks, 20 of which carried hazardous materials, according to the National Transportation Safety Board (NTSB).