On Tuesday afternoon, an evacuation order was issued in Cleves and Whitewater Township, Ohio, due to a leak of styrene, a toxic and flammable chemical used in plastic and rubber production, from a railcar.

The leak, which was confirmed to be from a pressure release valve on the railcar, prompted authorities to evacuate approximately 210 households and close nearby roads, including State Route 128 and U.S. Route 50.

In response to the incident, the Three Rivers Local School District canceled all classes and activities, and three school buildings were evacuated as a precaution.

Residents just outside the evacuation zone were advised to remain indoors and keep windows closed to minimize exposure.

The Central Railroad of Indiana identified the leak as styrene venting from one of its tanker cars near the intersection of U.S. 50 and State Route 128.

Firefighters worked to cool the railcar with water to prevent a potential explosion, as the chemical reaction was causing the styrene to heat and turn into gas.

By late Tuesday night, emergency crews successfully cooled the tank, and the leaking railcar was no longer venting, allowing for its safe removal.

As of Wednesday evening, officials lifted the evacuation order, declaring air quality and water sources safe for residents to return home.

No injuries have been reported, but some residents sought medical treatment for symptoms related to the leak, although specifics remain unconfirmed.

Environmental officials monitored air quality throughout the incident, measuring gas concentrations to assess the leak's impact on the community.

This incident follows a significant train derailment in East Palestine, Ohio, earlier this year, which raised safety concerns and led to new regulations in the rail industry.

President Biden has been briefed on the situation and is in contact with state and local officials, offering federal resources as needed.