The Department of Justice is suing Norfolk Southern over its train derailment in East Palestine, Ohio last month that spewed toxic materials.

In the lawsuit unveiled Thursday, federal prosecutors accuse the company of unlawfully polluting waterways with oil and hazardous substances from the derailed trains.

Norfolk Southern has pledged to ensure the area is fully cleaned up and the Biden administration has promised to make sure that happens.

The DOJ is seeking injunctive relief, cost recovery and civil penalties to “ensure it pays the full cost of the environmental cleanup,” according to the lawsuit.