On February 3, 2023, at 8:55 p.m. EST (UTC−5), a Norfolk Southern freight train derailed in East Palestine, Ohio, United States. The train was carrying hazardous materials when 38 cars derailed. Several railcars burned for more than two days and emergency crews also conducted controlled burns of several railcars, which released hydrogen chloride and phosgene into the air. Residents within a 1-mile (1.6-kilometer) radius were evacuated. Agencies from Ohio, Pennsylvania, West Virginia, and Virginia assisted in the emergency response.