It's another in a series of chemical leaks in Ohio and surrounding states, endangering communities and their residents.
Here's a look at a few of them.
The most recent leak, a railcar at a train yard in Cleves, west of Cincinnati, that was carrying styrene, a toxic and flammable chemical, developed a leak on Tuesday, the Cincinnati Enquirer reports.
Residents of about 210 homes within a half-mile of the leak were ordered to evacuate, and several schools were closed on Wednesday.
By Wednesday morning, the railcar had stopped leaking, officials say, but evacuation and shelter-in-place orders were still in effect over air quality concerns.
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