(NewsNation) — Emergency crews began releasing toxic chemicals into the air from derailed tanker cars that were in danger of exploding Monday after warning hundreds of Ohio residents to leave immediately or face the possibility of death.
Fearing a “catastrophic” explosion, officials conducted the controlled chemical release to reduce the risk of hazardous fumes and shrapnel being released into the air. The process involved blowing a small hole in the freight cars with a controlled charge, allowing the material to go into a trench rather than burning in the air.
Ohio Gov. Mike DeWine earlier ordered evacuations in the area of the derailment that has been smoldering since Friday night. Authorities believe most, if not all, residents in the danger zone had left but they were knocking on doors one more time before releasing the vinyl chloride inside the cars, he said.
“You need to leave, you just need to leave. This is a matter of life and death,” DeWine said at press conference.
Officials warned the controlled burn would send phosgene and hydrogen chloride into the air. Phosgene is a highly toxic gas that can cause vomiting and breathing trouble and was used as a chemical weapon in World War I.
“Some of the material is now burning off consistent with expectations from the earlier models, and is expected to drain for a short number of hours,” Norfolk Southern Railway said in a written statement Monday. “We have been, and will continue, monitoring air quality with the Ohio EPA. Remediation work at the site can now safely continue.”
The crash site is very close to the state line, and the evacuation area extends into a sparsely populated area of Pennsylvania. The Associated Press reported about half of the 4,800 residents in East Palestine had been warned to leave over the weekend before officials decided on Monday to use the controlled release.
Forced evacuations began Sunday night in the village of East Palestine after authorities became alarmed that the rail cars could explode after a “drastic temperature change” was observed in a rail car.
In this photo provided by Melissa Smith, a train fire is seen from her farm in East Palestine, Ohio, Friday, Feb. 3, 2023. A train derailment and resulting large fire prompted an evacuation order in the Ohio village near the Pennsylvania state line on Friday night, covering the area in billows of smoke lit orange by the flames below. (Melissa Smith via AP)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
This photo taken with a drone shows portions of a Norfolk and Southern freight train that derailed Friday night in East Palestine, Ohio are still on fire at mid-day Saturday, Feb. 4, 2023. (AP Photo/Gene J. Puskar)
An Ohio state trooper goes door to door telling residents to leave downtown East Palestine, Ohio, on Sunday, Feb. 5, 2023. A smoldering tangle of dozens of derailed freight cars, some carrying hazardous materials, has kept an evacuation order in effect in Ohio near the Pennsylvania state line as environmental authorities warily watch air quality monitors. (Lucy Schaly/Pittsburgh Post-Gazette via AP)
Equipment and gravel pile up along the railroad tracks in downtown East Palestine, Ohio, on Sunday, Feb. 5, 2023. A smoldering tangle of dozens of derailed freight cars, some carrying hazardous materials, has kept an evacuation order in effect in Ohio near the Pennsylvania state line as environmental authorities warily watch air quality monitors. (Lucy Schaly/Pittsburgh Post-Gazette via AP)
An employee of HEPACO works in a creek along Sumner Street in downtown East Palestine, Ohio, on Sunday, Feb. 5, 2023. A smoldering tangle of dozens of derailed freight cars, some carrying hazardous materials, has kept an evacuation order in effect in Ohio near the Pennsylvania state line as environmental authorities warily watch air quality monitors. (Lucy Schaly/Pittsburgh Post-Gazette via AP)
East Palestine police block roads in downtown East Palestine, Ohio, on Sunday, Feb. 5, 2023. A smoldering tangle of dozens of derailed freight cars, some carrying hazardous materials, has kept an evacuation order in effect in Ohio near the Pennsylvania state line as environmental authorities warily watch air quality monitors. (Lucy Schaly/Pittsburgh Post-Gazette via AP)
Residents were packing overnight bags, loading their pets into cars and searching for hotel rooms Monday morning. Police in the village moved out of their communication center as the threat of an explosion increased.
Police cars, snow plows and military vehicles from the Ohio National Guard blocked streets leading into the area.
About 50 cars, including 10 carrying hazardous materials, derailed in a fiery crash Friday night, according to rail operator Norfolk Southern and the National Transportation Safety Board. No injuries to crew, residents or first responders were reported.
It is not clear what caused the train to veer off its tracks, but a rail car axle may be to blame, according to federal investigators from the National Transportation Safety Board.