A suit filed in federal court in New Jersey accuses German luxury carmakers of colluding to sell their cars at inflated prices in the United States.

The suit accuses the makers of Mercedes-Benz, BMW, Audi, Porsche and Bentley vehicles of participating in a 20-year conspiracy to unlawfully increase their vehicles’ prices through collaboration on technology, suppliers and emissions controls, according to the suit. Filed on Tuesday on behalf of a nationwide class of car buyers, the suit comes amid media reports that the companies face price-fixing investigations in the U.S. and Europe. A similar suit was filed on behalf of Canadian car buyers Tuesday in Montreal.