Volkswagen admitted Friday that it rigged emissions tests in at least 10 states, according to a lawsuit filed by a former employee.

The U.S. Environmental Protection Agency said Friday that the German automaker admitted to a violation of federal air quality regulations in five states.

Volkswagen had been in talks with regulators in Ohio and Indiana over the emissions scandal.

The automaker said it was working to resolve the dispute and that it would not comment further on pending litigation.

The lawsuit, filed by the American Lung Association, is the latest development in the long-running emissions scandal that has tarnished Volkswagen’s reputation.

VW has admitted that it cheated on diesel emissions tests and agreed to a $7 billion settlement with U.K. authorities last year.

The company said in September that it had permanently banned its diesel vehicles in the U.I.S., Canada and Mexico.

Volkswagen has also settled with federal regulators in the Netherlands and Canada.

A spokeswoman for the U,A.,B.C., Canada-U.S.-Mexico office of the Environmental Protection Administration declined to comment.