The U.S. Environmental Protection Agency is continuing to monitor the air, water and soil impacts from a train derailment that happened in East Palestine, Ohio, earlier this month.
Investigators said a broken axle caused the derailment of about 50 rail cars, including 10 carrying hazardous materials, on Feb. 3. No one was injured in the wreck.
Here's a timeline of events.
What we know:East Palestine train derailment
Ohio train derailment:East Palestine residents file lawsuit seeking medical testing
Feb. 3
A Norfolk Southern Railroad freight train derailed in East Palestine, Ohio, at approximately 8:55 p.m., the U.S. Environmental Protection Agency said. Norfolk Southern reported the incident to the National Response Center at 10:53 p.m.
The train was comprised of about 150 cars and 50 were affected. According to the National Transportation Safety Board, 20 of the 150 cars contained hazardous materials, and 10 of those were impacted by the wreck.
Federal investigators said a mechanical issue with a rail car axle caused the derailment.
Feb. 4
Responders discovered contaminated runoff from the derailment impacting the nearby Sulphur Run and Leslie Run streams, the EPA said. Norfolk Southern contractors installed booms and underflow dams to restrict the flow of contaminated water.
Residents near the derailment were asked to leave the area.
Feb. 5
Ohio Gov. Mike DeWine asked remaining residents to leave the area due to a rail car being at risk of exploding.
Feb. 6
DeWine and Pennsylvania Gov. Josh Shapiro ordered the immediate evacuation of any remaining residents so Norfolk Southern could execute a controlled release of the rail cars' chemicals, preventing an explosion.
Remaining residents within a 1-mile by 2-mile area surrounding the village were ordered to leave before Norfolk Southern started the controlled release and burn of vinyl chloride in five cars around 3:30 p.m.
Feb. 8
DeWine, Shapiro, East Palestine fire chief and incident commander Keith Drabick and other officials from both states said East Palestine residents could safely return home.
NewsNation correspondent Evan Lambert was arrested for trespassing while attending DeWine's press conference about the derailment. In a statement, East Palestine police said they asked Lambert to stop his live report because he was being "loud," which resulted in an argument. Police said they arrested the broadcast journalist after he refused to leave the area.
Lambert was held in custody for about five hours before he was released, NewsNation reported. DeWine said at the end of the press conference that he did not authorize the arrest.
Feb. 10
Contractors with Norfolk Southern installed a dam and water bypass at Sulphur Run to prevent further contamination of downstream waters.
The EPA sent a general notice of potential liability letter to Norfolk Southern, listing the areas the company may be liable for damages and cleanup pertaining to the wreck. According to the letter, some of the derailed rail cars contained vinyl chloride, ethylene glycol monobutyl ether, ethylhexyl acrylate, isobutylene and butyl acrylate.
Feb. 13
Norfolk Southern submitted its remedial action plan to the EPA, detailing how it has responded to the derailment so far and what further actions it proposes.
This story will be updated.
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