South Korean owners of Volkswagen’s 3.0-liter diesel vehicles plan to file a class-action suit against the German carmaker in the United States next month.

Local law firm Barun said Tuesday that it will file a class-action suit in the U.S. first and then in South Korea.

Barun explained its decision came as Volkswagen acknowledged to the U.S. Environmental Protection Agency(EPA) that its 3.0-liter diesel cars were part of the emissions-cheating scheme in addition to 2.0-liter ones.

The law firm added that as the legal suits concerning Volkswagen’s 3.0-liter diesel cars are already under way in the U.S., it only needs to convene the South Korean victims in order to file a class-action suit in the U.S.

Around 85-thousand Volkswagen, Audi and Porsche 3.0-liter diesels sold in the U.S. were revealed to be equipped with software engineered to cheat on emissions tests.

In South Korea, around 100-thousand 3.0-liter diesel cars manufactured by Volkswagen and its affiliates are presumed to have the illegal devices.